A boat moves relative to water with a velocity which is a times less than the river flow velocity . At angle of the stream direction must the boat move to minimise drifting?

A boat moves relative to water with a velocity which is a times less t

1.	A boat moves relative to water with a velocity which is a times less than the river flow velocity . At angle of the stream direction must the boat move to minimise drifting?
Answer» ANSWER :`[pi/2+sin^(-1)(1/n)]`