Question
Out of 240 kilometres, a person covers some distance by
foot and the rest by bicycle. If walking speed is 6 km/h and bicycle speed is 30 km/h, and 25% of the trip is done on foot, calculate the average speed of the total journey.Solution
ATQ,
Time taken walking = (0.25 × 240) / 6 = 60 / 6 = 10 hours
Time taken cycling = (0.75 × 240) / 30 = 180 / 30 = 6 hours
Average speed = 240 / (10 + 6) = 240 / 16 = 15 km/h
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