Question
A car travels from town P to town Q at 60 km/h and
returns from Q to P at 40 km/h. What is the average speed for the whole journey?Solution
Let distance P–Q = D. Time forward = D/60, time return = D/40 Total distance = 2D 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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