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21 February, 03:57

The distance between two piers on a river is 45 miles. It takes a motorboat, moving downriver, 2 hr 15 min to complete the journey. How much time does it take the same boat to go back upstream if the current flows at 2.5 mph?

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  1. 21 February, 04:14
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    Answer: 3 hours

    Step-by-step explanation: we can make a variable for our answer (x)

    Now, we need to find the speed of the boat without the current (y)

    we can make this equation: d/t = s: 45 / (y + 2.5) = 2 1/4

    hence: y = 17.5

    now we can substitute in the current's speed: y - 2.5

    17.5 - 2.5 is 15

    now we can solve for x

    45/15 = 3

    hence, we get 3 hours as our answer
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