On a particular day the time taken by boat A to cover 255 km downstream is 2 hours more than the tim...........

Quantitative Aptitude ( CCS) Boats and Streams

Direction : Study the following bar graph and answer the questions that follow:

On a particular day, the time taken by boat A to cover 255 km downstream is 2 hours more than the time taken by boat D to cover 195 km upstream. Find the ratio of upstream speed to downstream speed in case of boat A on that particular day.

4 : 11

3 : 5

15 : 22

8 : 19

7 : 17

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Explanation:

Let x km/hr is the speed of stream on that particular day.
So 255/(12+x) = 195/(20-x) + 2
Solve, x = 5 km/hr
So in case of boat A, ratio of speed upstream : downstream = (12-5) : (12+5) = 7 : 17

Hence, option 5 is the correct answer.