Question

A Man takes $3$ hours $45$ Minutes to row a boat $15$ $km$ . downstream of a river and $2$ Hours $30$ Minutes to cover a distance of $5$ $km$ upstream. Find the speed of the river current in $km/hr$

Answer 1

Speed Upstream $=\frac{15}{3\frac{3}{4}}$

$=4kmperhr$

Speed Downstream $=\frac{5}{2\frac{1}{2}}$

$=2kmperhr$

We know that the speed of current

$=\frac{1}{2}\times (speeddownstream-speedupstream)$

$=\frac{1}{2}\times (4-2)$

$=\frac{1}{2}\times 2$

$=1kmperhr$