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Q.

A man can swim in still water at a speed of 4 kmph. He desires to cross a river flowing at a speed of 3 kmph in the shortest time interval. The speed of man wrt to ground is___[width of the river = 1km]

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An Intiative by Sri Chaitanya

a

$5 k m p h$

b

$1 k m p h$

c

$7 k m p h$

d

$12 k m p h$

answer is D.

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Detailed Solution

$v_{S} = \sqrt{{v_{R}}^{2} + {v_{S R}}^{2}} = 5 k m p h$

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