He covers one-fourth of the total distance at 20 km/hr, one-fourth at 10 km/h and rest of his journey at 80 km/h. Find Rohit’s average speed

Question

He covers one-fourth of the total distance at 20 km/hr, one-fourth at 10 km/h and rest of his journey at 80 km/h. Find Rohit’s average speed for the whole distance?

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Julia 4 weeks 2021-11-03T19:59:21+00:00 1 Answer 0 views 0

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    2021-11-03T20:00:54+00:00

    Answer:

    Let the dstance be 400 km

    Time taken to cover first one-fourth

    = 100/20 = 5 h

    Time taken to second one-fourth = 100/10 = 10h

    Time taken to rest of the distance = 200/80 = 2.5h

    Average speed = 400/17.5

    = 22.8km/h ans.

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