Question

A girl swims across a river. When she swims in still water, she swims at 1.25 m/s, the river flows parallel to its banks at v m/s. The girl aims to swim upstream at angle θ degrees parallel to the river bank so that her resultant velocity of 1 m/s is along AB, perpendicular to the river bank.
Find V and θ

Answer 1

sin θ = 1/1.25

tan θ = sin θ/cos θ = 1/v