A boat man could row his boat with a speed 10 m/sec. He wants to take his boat from P to a point Q just opposite on the other bank of the river flowing at a speed 4 m/sec. He should row his boat–

Options

A. at right angle to the stream
B. at an angle of `sin^(-1)(2//5)` with PQ up the stream
C. at an angle of `sin^(-1)(2//5)` with PQ down the stream
D. at an angle `cos^(-1)(2//5)` with PQ down the stream

Answer

B