Question 81

A man rows upstream 16km and down stream 28km, taking 5 hour each time, the velocity of the current

Solution

Let the man's speed be m and the speed of current be c

Time taken in downstream = $$ \frac{28}{m+c}$$ = 5

Time taken in upsteam = $$ \frac{16}{m-c}$$ = 5

Subtracting second equation from first equation, we get 10 c = 12 or c = 1.2

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