Question

A boat is sent across a river with velocity of 8km/h .If the resultant velocity of boat is 10km/h then the velocity of the river water is

Answer 1

2 KMPH , most probably , as he is going opposite to water , or if 90 ° , then 1 kmph

Answer 2

This can be simply done by Pythagorean triplets the boat velocity is perpendicular to the river velocity

Therefore
$\sqrt{ {10}^{2} - {8}^{2} }$
$\sqrt{100 - 64}$
$\sqrt{36}$
=6 km/hr