Question
A car travels from town A to town B at 60 km/h and
returns from B to A at 40 km/h. What is the average speed for the whole journey?Solution
ATQ, If distance each way = D, Total distance = 2D Time from A to B = D/60 Time from B to A = D/40 Total time = D/60 + D/40 = (2D + 3D)/120 = 5D/120 = D/24 Average speed = Total distance / Total time = (2D) / (D/24) = 2D × 24/D = 48 km/h
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