math

On a journey across munbai,a taxi average 20mph for 76% of distance,25 mph for 10% of distance and 8 mph for remainder.then average speed of whole journey is?

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  1. so if the total distance is x miles, then the partial distances are :
    .76x , .1x and .14x
    the 3 different times are:
    .76x/20 , .1x/25 , and .14x/8

    avg speed = total distance/total time
    = x/(x (.76/20 + .1/25 + .14/8) )
    = 1/(.038 + .004 + .0175)
    = 1/.0595
    = appr 16.8 mph

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