Question

7
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-
(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 of (cos)^-1(2/5) with PQ down the stream​

Answer 1

Answer:

C

hope it helps

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Answer 2

Answer:

Here is the answer to your question

To reach at point Q he should go towards left side

of Q as water is flowing in W-E direction. Angle will be sin^-1 0.4 =66 degrees.

Sin 66 degree= RQ/RP 4/10=RQ/RP 2/5

HENCE HE SHOULD ROW AT AN ANGLE OF SIN^-1 (2/5) WITH PQ UP THE STREAM.