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Quantitative Aptitude :: Boats and Streams - Discussion

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Choose the correct option.

The current of a stream runs at the rate of 4 kmph. A boat goes 6 km and back to the starting point in 2 hours, then find the speed of the boat in still water?

A10 kmph

B21 kmph

C8 kmph

D12 kmph

Answer: Option (Login/Signup)

Show Explanation

d1/s1 d2/s2 = total time and d1=d2=6km
speed upstream s1= x-4
speed downstream s2= x+4
where x= speed of boat in still water



6/ (x-4) + 6/(x+4)=2



Solving the above equation we get x = 8, -2



So x=8kmph is the correct answer.

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