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Practice mode Time and Distance

A courier covers three equal stretches of a route at 20 km/h, 30 km/h and 60 km/h respectively. What is the average speed for the whole route?

Correct answer B. 30 km/h

Explanation

Take each stretch as 60 km: times are 3, 2 and 1 hours. Average speed = 180 / 6 = 30 km/h, not the simple mean of the speeds.

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