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?
Let Puri's rowing speed be
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.