An aeroplane flies from place A to place B at the speed of 500 kms/hour. On the return journey, its speed is 700 kms per hour. The average speed of the aeroplane for the entire journey is

To calculate the average speed, we need to know the total distance travelled and the total time taken. The total distance travelled is 2 * 500 = 1000 km.

The total time taken is 500 / 500 + 700 / 700 = 12 hours.

The average speed is therefore 1000 / 12 = 583 kms/hour.