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28 December, 12:38

Jim paddles from one shore of a lake 3 miles wide at 4mph, and John paddled from the opposite shore at 5mph. How long will they travel before they meet?

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  1. 28 December, 12:40
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    Let X = time

    Jim paddles 4 mph for x time = 4x

    John paddles 5 mph for x time = 5x

    write an equation: 4x + 5x = 3 miles

    9x = 3 miles

    Divide both sides by 9:

    x = 3/9

    x = 1/3 of an hour = 20 minutes.
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