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A ferry departs from a port along the Sands River at 10:00 am. The ferry travels at a speed of 15 mph in still water and returns to port at 2:00 pm. If the ferry trip upstream takes twice as long as its return trip downstream, what is the speed of the river’s current

 Jan 21, 2020
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Let its speed upstrem =S
Its speed downstream =2S

 

[S + 2S] / 2 = 15,
[2S - S] / 2 = R, solve for S, R


S = 10 mph - its speed upstrem
10 x 2 =20 mph - its speed downstream
R =5 mph - the speed of the river's current.

 Jan 21, 2020

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