# Math

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Boat travels 10 mi upstream and 10 mi downstream the stream is moving 1mph and the boat took 5 1/3hrs. What is the speed of boat if the stream still?

• Math -

speed of boat in still water --- x mph

time upstream = 10/(x-1)
time downstream = 10/(x+1)

isn't the total time 16/3 hours ?

I am sure you can take it from here.

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