Q.

A boat moves perpendicualar to the bank with a velocity of 10.8 km/h. The current carries it 200 m downstream, the time required to cross the river. (The width of the river is 0.6 km).

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a

3.33min

b

2.15min

c

3.11min

d

5.11min

answer is A.

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Detailed Solution

t=dVb=60010.8×518=6003=200sec             t=20060=3.33min
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A boat moves perpendicualar to the bank with a velocity of 10.8 km/h. The current carries it 200 m downstream, the time required to cross the river. (The width of the river is 0.6 km).