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Question

The shortest possible time required by the boat to cross the river will be:-
1100699_40686f1db31947139e44c476a07c8d14.png

A
125 sec
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B
250 sec
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C
500 sec
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D
2503 sec
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Solution

The correct option is A 125 sec

Shortest possible time will be when boat makes no angle with AB i.e vertical speed is 2m/s.
(Refer to Image)
t=distancespeed
=500m4m/s
=125sec

1205062_1100699_ans_b94e74f6a19e4b2f898f576b7345db49.png

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