Ahunter wishes to cross a river that is 1.5 km wide and flows with a velocity of 5.0 km/h parallel to its banks. the hunter uses a small powerboat that moves at a maximum speed of 12 km/h with respect to the water. what is the minimum time for crossing?

137.48 s

Explanation:

Given

Width of river=1.5 km

velocity of river=5 km/h

velocity of boat w.r.t river =12 km/h

To cross the river in minimum time hunter needs to cross the river perpendicular to the flow

i.e. velocity of boat w.r.t  water must be perpendicular

i.e. x component of boat must be equal to river flow

where is angle made by boat w.r.t bank

its vertical component is

Time taken

c) up

hope this