Q.

A boat takes 4 hr upstream and 2hr down the stream for covering the same distance. The ratio of  velocity of boat to the water in river is

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a

1 : 3

b

3 : 1

c

1:3

d

3:1

answer is B.

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Detailed Solution

t1t2=Vb+vwVb−vw⇒vbVw=4+24−2=62=31
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