When aero plane left town P (65º N,15º E) to another town Q (65º N,165º W) at a speed of 200 knots using the shortest route. Take π = ^{22}/_{7} and radius of the earth R= 6370 km.

 Calculate the distance travelled in nautical miles.
 Calculate the time taken to travel from P to Q in hours.
 Another plane left P at 1.30 pm local time and travelled to T (65ºN,60ºE) along a parallel of latitude. Calculate the:
 Distance between P and T to the nearest km
 Local time of arrival at town T if the plane flew at the speed of 470 km/h