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24 November, 13:15

Annette drives her car 105 miles and has a mean of a certain speed. if the mean speed had been 4mph more, she could have traveled 119 miles in the same length of time. what was her mean speed?

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  1. 24 November, 14:57
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    Let the mean speed be x mi/hr

    Time taken to travel will be:

    distance / speed

    thus:

    105/x=119 / (x+4)

    solving for x we get:

    105 (x+4) = 119x

    105x+420=119x

    119x-105x=420

    x=30 mi/hr

    Thus the mean speed is 30 mi/hr
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