Question

The positions of towns X and Y are given to the nearest degree as X(40°N, 124°E) and Y(40°N,56°W)

1. Longitude difference 
2. Find the distance in nautical miles between x and y along a parallel of a latitude.  
3. Find the distance XY via the north pole in nautical mile.  
4. A plane flying at 200 knots leaves y at 2.00p.m. on Monday what time and day does it arrive at x via great circle. 

Answer 1

1. Longitude difference
   124 + 56 =180°
2. 180 × 60cos40
      =8,237.28nm
3. Distance XY
   100 × 60=6000nm
4. t= 6000
        200
   =30hrs
   time difference  180×4 =12hrs
                              60
   Time at X =2.00a.m