A motorist covers 260 km in 5 hours, driving partly at 40 km/h and partly at 70 km/h. What distance did he cover at 70 km/h?

Correct answer A. 140 km

Explanation

Average speed = 52 km/h. Time at 40 : time at 70 = (70 - 52) : (52 - 40) = 3 : 2, so 2 hours at 70 km/h = 140 km.

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