Question
A person travels 40 km at 20 km/h and returns 40 km at
30 km/h. Find the average speed for the whole journey.Solution
ATQ, Total distance = 40 + 40 = 80 km Time going = 40/20 = 2 h Time returning = 40/30 = 4/3 h Total time = 2 + 4/3 = (6/3 + 4/3) = 10/3 h Average speed = Total distance / Total time = 80 ÷ (10/3) = 80*(3/10) = 24 km/h
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