Longitudes and Latitudes Questions and Answers - Form 4 Topical Mathematics

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Questions

  1. The latitude and longitude of two stations P and Q are (47oN, 25oW) and (47oN, 70oW) respectively. Calculate the distance in nautical miles between P and Q along the latitude 47oN
  2. A pane leaves an airport P (10oS, 60oE) and flies due north at 800km/hr. By taking radius of the earth to be 6370-km and 1 nautical mile to be 1.853km,
    1. Find its position after 2hrs
    2. The plane turns and flies at the same speed due West to reach Q longitude 12oW.
      Find the distance it has traveled due in West nautical miles
    3. Find the time it has taken
    4. If the local time at P was 1300hrs when it reached Q. Find the local time at when it landed at Q
  3. Bot juice company has two types of machines, A and B, for juice production. Type A machine can produce 800 litres per day while type B machine produces 1600 litres per day. Type A machine needs 4 operators and type B machine needs 7 operators. At least 8000 litres must be produced daily and the total number of operators should not exceed 41. There should be 2 or more machines of each type. Let x be the number of machines of type A and y the number of machines for type B,
    1. Form all inequalities in x and y to represent the above information
    2. On the grid provided below, draw the inequalities and shade the wanted regions
    3. Use the grid in (b) to determine the least number of operators required for the maximum possible production
  4. Points R and S are two points on the surface on a latitude 48°S. The two points lie on longitudes 30°W and 150°E respectively. By taking the earth’s radius to be 6370km, calculate:
    1. The distance from R to S along a parallel of latitude.
    2. An aeroplane flies at an average speed of 2 80km/h from R to S along a great circle through the South Pole. Calculate the total time taken.
    3. The local time of R when the local time of R is 2.l5m.
    4. Another point Q is 600Nm North of R .Find the location of Q
  5. A jet flies from 34oN, 12oE to (34oE , 24oE) in 1½ hrs. Find its average speed in knots and are two points on a geographical globe of diameter 50 cm. They both lie on a parallel latitude 50o North. P has longitude 90o West and Q has longitude 90o East. A string AB has one end at point P and another at point Q when it is stretched over the North pole. Taking π= 3.142;
    1. Calculate the length of the string.
    2. If instead the string is laid along the parallel of latitude 50oN with A at point P, calculate the longitude of point B
    3. State the position of B if the string is stretched along a great circle of P towards the South pole if point A is static at P.
  6. Two points A(70o, 15oE) and B lie on the same circle of latitude on the earths surface. Given that the shortest distance between the two points along the circle of latitude is 2133.6km. Giving coordinates to the nearest degree, find the location of B.
    (Take π= 22/7 and radius of earth = 6380km)
    longitudes q6
  7. The position of two towns A and B on the earth’s surface are (36oN, 49oE) and (36oN, 131oW) respectively (Earth’s radius =6370km and π= 22/7):-
    1. Find the longitudinal difference between the two towns
    2. Calculate the distance between the towns:-
      1. Along a circle of latitude (in km)
      2. Along the great circle in km and nautical miles
    3. Another town C, is 840km due East to town B. Locate the position of town C
  8.  P, Q and R are points on the surface of the earth such that P (60ºN, 20ºW), Q (60oS, 20oW) and R(60oN, 80oE) find:
    1. The shortest distance between P and Q on the surface of the earth in kilometres and nautical miles(nm)
    2. The length of latitude 60ºN and hence the length of the minor arc PR in kilometres
    3. The distance from P to the North Pole
  9. A jet flies from town X (50oS, 20oE) directly to Y(50oS, 28oW) and then due South for 1200m to Z
      1. Find the latitude of Z
      2. Calculate the distance XY along a parallel of latitude 50oS in km
      1. Given that the average speed of the jet is 400 knots, calculate the time taken to reach Z from X to the nearest 0.1hour
      2. Find the time of arrival at Z given that the plane left X at 7.40a.m. Take π= 22/and radius of the earth to be 6370km
  10. A jet on a rescue mission left town A(35oS, 15oE) to town B(45oN, 15oE) and then to town C(45oN, 45oW). If 1o subtends 60nm and the radius of the earth is 6370km. Find;
    1. the distance in nautical miles from A to C via B correct to 4 s.f
    2. the distance in kilometers from A to B to the nearest km
    3. the jet flew at 840km/h from A to C. If the jet left town A at 8.15a.m, what time will it arrive at town C in local time

Answers

  1. (70 – 25 x 60 = 2700
    2700 Cos 47= 2700 x 0.68 = 1841.4nm
  2.  
    1. 22 x 6370 x 2 x α= 1600
      7                    360
      α = 14.4o
      Position (4.4oN, 60oE)
    2. 72 x 60 cos 4.4o
      = 4307nm

    3. T = D = 4307 x 1.853
            S            800
      = 9.976 hrs
    4. Difference in longitude = 72o
      15o – 1hr
      ∴ 72o = 72
                  15 = 4.8hrs = 4hrs 48mins behind
      1300hrs
      - 448
      8.12a.m
  3.  
    1. 800 x + 1600 y ≥ 8000
      x + 2y ≥ 10
      4x + 7y ≤ 41
      x ≥ 2
      y ≥ 2
    2.  
      longitudes ans 3b
    3. for type A = 3 and B = 4
      No. of operators = (3x4) + (4x7)
  4.  
    1. 180/300 x 2 x 22/7 x 6370 cos 48 = 13,396Km
    2. Km = (180 – 96) x 2 x 22/7 x 6370
                      360
      =84/360 x 2 x 22/7 x 6370 = 9342.7 km
      Time = 9342 = 33.36 km/hr
                  280
    3. θ= 180°

      time = (4 x 180) = 12 hrs
                      60
      (14:15 – 12:00) = 2:15a.m
    4. 600 Nm
      60
      60°
      Q = (12N, 30W)
  5.  
    1. AB = 80 x 2 x 3.142 x 25
              360
      = 4 x 25 x 3.142
             9
      =314.2 cm
              9
      = 34.9111 cm.
    2.  θ   x 2 x 3.142 x 25cos 50o = 314.2
      360                                           9
      θ= 314.2 x 360
      9
      50 x 3.142 x cos 50
      = 93.35o
      Longitude of BC(93.35o – 90o)E
      = 03.350E.
    3.   θ   x 3.142 x 50 = 314.2
      360                           9
      θ = 314.2/9 x 360
              3.142 x 50
      = 80o
      Latitude of B (80o – 50) S
      = 30oS
      Position of B (30oS, 03.35oE
  6. 2133.6 = x   x  2 x 22 x 6380 cos 70o
                  360           7
    α = 21.33 x 6 x 360 x 7
          44 x 6380 x cos 70o
    α+ 15o = 56o
    = 56 – 15 = 41oN
    ∴ Location of B is B(70o S, 41o N
  7.  
    1. Longitudinal diff = 180o
    2.  
      1. 180/360 x 2 x 22/7 x 6370 x cos 360o
        = 16196.52m
      2. 180/360 x 2 x 22/7 x 6370
        = 12012km
    3. θ/360 x 2x 22/7 x 6370 cos 36= 840
      = 9.3353o
      = position C = 131-9.3oW
      C(36o N, 121.7oW)
      longitudes ans 8
  8.  
    1. PQ = 120/360πx 6370 x 2
      =240/360πx22/7x 6370 = 13,346.6
    2. 2PR cos 60°
      PR = 100/360x2x 6370 cos 60
      =200/360 x 22/7 x 6370 cos 60 = 5561.1km
    3. PN = 30/360x2 x 22/7 x 6370
      = 3336.67 km
  9.  
      1. 60 (z -50) = 1200
        Z = 20
        Z = 70oS
      2.  xy = 48  x 2 x 6370 cos 50
                 360
        = 3431.629km
      1. XZ = 3431. 627 + 1200
                   1.853
        = 3051.9km
        Time = 3051.9 = 7.6hrs
                      400
      2. tie = 7.36 + 4.28 = 12.04
  10.  
    1. A – B = 45 + 35 = 80o Lat. Diff
      = 80 X 60 = 4800nm
      B – C = 15 + 45 = 60olong. Diff
      = (60 X 60 X cos 45
      = 3600 X 0.7071 = 2545.56nm
      Total distance = ( 4800 + 2525.56)nm
      = 7345.56nm
      302
      ≈7346nm (4.s.f)
    2. 80   X  2 X 22 X 6370
      360            7
      = 88 x 910
              9
      = 8897.78 km
      ≈8898km ( to nearest km)
    3. B- C = 60  X  2 X 22 X 6370 X cos 450
                 360           7 
      = 22 X 910 X 0.7071
                       6
      = 471.8.7 km
      A – C in Km = ( 8898 + 4718.70
      =13616.7 km
      Time taken = 13616.7 = 16.21 hours
                              840
      = 16 hrs 13min
      Arrival time = 08.15 + 16.13 = 24.28
      = 12.28 am following morning

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