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11 October, 00:03

Two cars are 261 miles apart and travel toward each other on the same road. They meet in 3 hours. One car travels 3 mph faster than the other. What is the average speed of each car?

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  1. 11 October, 00:12
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    Let the speed of first car be x mph

    the speed of the second one is (x+3) mph

    Relative speed=x+x+3 = (2x+3) mph

    but

    time=distance/speed

    thus

    3 = (261) / (2x+3)

    solving for x we get:

    3 (2x+3) = 261

    6x+9=261

    6x=261-9

    6x=252

    hence:

    x=42 mph

    Thus the average speed of first car is 42 mph

    Average speed of the second car is (42+3) = 45 mph
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