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Practice mode Time and Distance

A train covers 420 km at 70 km/h. By how much must its speed increase for the journey to take 1 hour less?

Correct answer D. 14 km/h

Explanation

Usual time = 420 / 70 = 6 hours. New time 5 hours needs speed 420 / 5 = 84 km/h, an increase of 14 km/h.

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