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30 October, 22:52

David is rowing a boat upstream. The river is flowing at a speed of 2 miles per hour. David starts rowing at a speed of 6 miles per hour, and his speed decreases at a rate of 1.5 miles per hour.

The equation gives the speed of the boat after David has rowed for x hours.

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  1. 30 October, 23:17
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    Speed of boat = rowing speed - speed of current

    rowing speed is a decreasing linear function, initially 6 and decreasing by 1.5 every hour.

    ---> 6 - 1.5x

    Speed of boat = (6-1.5x) - 2 = 4 - 1.5x
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