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Military Causes of the Sepoy Mutiny

A river is fl...

Question

A river is flowing from east to west at a speed of $5 m / m i n$ . A man on south bank of river, capable of swimming $10 m / m i n$ in still water, wants to swim across the river in shortest time. He should swim,

A

Due north-east with double the speed of river

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B

Due north-east

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C

Due north

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D

none of these

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Solution

The correct option is C Due north
Step 1:
Draw a labelled diagram.

Step 2:
Find the direction of swimmer.
For shortest time, swimmer should swim along 𝐴𝐵, so he will reach at point 𝐶 due to the velocity of river. i.e., he should swim due north.
Final Answer: (a)

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