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18 February, 00:13

David and Terri drove a small motorboat down a river with the current. The rate the boat traveled in still water was r miles per hour, and the current's average speed was c miles per hour. It took them 1.5 hours to travel 4 miles downstream. Which of the following equations can be used to represent this information?

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  1. 18 February, 00:29
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    Speed of boat r mi/hr

    speed of currect c mi/hr

    speed downstream (c+r) mi/hr

    but

    distance = 4miles

    time=1.5 hours

    thus

    speed=distance/time

    hence:

    4/1.5 = (c+r)

    thus

    4=1.5c+1.5r

    hence the answer is:

    4=1.5c+1.5r
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