Question

A car travels from plane A to the plane B at 20km/hour and returns at 30km/hour.the average speed of the car for the whole journey

Answer 1

Since the car travels back to the same point A its displacement is zero
distance travelled = v×t=40×1=40km
average speed=total distance / total time taken
50+30/2
80/2
40km/h

Answer 2

please refer the attachment.

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