Question

A boat moves relative to water with a velocity which is n times the river flow

Answer 1

Explanation:

Steps:

1) Let the relative velocity of boat be 'v' m/s making an angle  with vertical .Then,the velocity of river is '2v' in hrizontal direction .

Then,we will try to break velocity of boat in two components .

2) We observe that resultant velocity of boat :





3) Let the width of river be 'd' .

Time required to cross the river,t : 

Since, we observed that  ,so drift can't be 0.

4) That is,

Drift ,x = 

= 

For Drift to be minimum,