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Q.

A boat running upstream takes 8 hours to cover a certain distance while it takes 5 hours to cover the same distance running downstream. What is the ratio between the speed of boat and the speed of water current respectively?

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a

13:8

b

8:13

c

3:13

d

13:3

answer is D.

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Detailed Solution

Solution: Speed of  the boat in still water = x

Speed of  current = y

So,

8(x−y)=5(x+y)

8x−8y=5x+5y

8x−5x=5y+8y

3x=13y

xy= 13:3

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