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A boat moves at a rate of 14mph in still water. If the river's current flows at a rate of 5 mph, how long does it take the boat to travel 35 miles upstream?

 Oct 8, 2018
 #1
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The speed of the boat upstream =14 - 5 =9 mph
Distance =Speed x Time
35 =9 x T
T =35 / 9
T =3 8/9 - hours - or about 3 hours and 53 1/3 minutes.

 Oct 8, 2018
 #2
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Yes, when it goes upstream you have to subtract, but, if it is heading downstream, then you have to add!

 Oct 8, 2018

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