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7 August, 03:28

Blake rows his boat against a current 90 yards in 15 minutes. With a current, he rows 90 yards in 9 minutes. What is the rate at which Blake rows, and what is the rate of the current.

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  1. 7 August, 07:19
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    90 yards in 15 minutes = 6 yds/min

    90 yards in 9 minutes = 10 yds/min

    x = current rate

    r = rowing rate

    r + x = 10

    r - x = 6 Adding both equations

    2 r = 16

    rowing rate = 8 yds/min

    x = 2 yds/min (current rate)
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