Question
A car goes from town A to town B at 60 km/h and returns
from B to A at 40 km/h by the same route. What is the average speed for the whole journey?Solution
Let the one-way distance be D km. Time from A to B = D / 60 Time from B to A = 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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