Pratap Puri rowed 18 miles down the Delaware River in 2 hours, but the return trip took him 42 hours. How do you find the rate Pratap can row in still water and find the rate of the current?

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Answer 1 · 2016-10-18T04:18:59

#33/7 mph and 30/7 mph#

Let Puri's rowing speed be #v_P# mph. Let the speed of the current

be #v_C# mph.Then, for the down stream rowing,

Resultant ( effective )

speed X time = 2(v+P+v_C)= distance = 18 miles.

For the up stream rowing,

#42 ( v_P-v_C)= 18 miles.

Solving,

#v_P=33/7 mph and v+C=30/7 mph#

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