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A train travels 250 km partly at a speed of 20 km/hr and the remaining

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| A train travels 250 km partly at a speed of 20 km/hr and the remaining at a speed of 45 km/hr. If the speeds are reversed then it travels 20 km more at the same time. Then find the average speed of the train to travel 250 km?

A. 25 km/hr

B. 28 km/hr

C. 37.5 km/hr

D. 31.25 km/hr

Right Answer is: D

SOLUTION

Let train travel with 20 km/hr for x hours and with 45 km/hr for y hours .

⇒

Average speed =

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