On a particular day ratio of upstream speed to downstream speed of boat D is 3 7 It took 20 hours mo...........

Quantitative Aptitude ( CCS) Boats and Streams

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

On a particular day, ratio of upstream speed to downstream speed of boat D is 3 : 7. It took 20 hours more to cover a distance upstream than same distance downstream by boat D. On that particular day, boat B covered same distance in how much time?

17.5 hours

15 hours

19 hours

19.5 hours

18.5 hours

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Explanation:

Let speed of stream on that day = x km/hr
So (20-x)/(20+x) = 3/7
Solve, x = 8 km/hr
So y/(20-8) – y/(20+8) = 20
Solve, y = 420 km
So required time = 420/(16+8) = 420/24 = 17.5 hours

Hence, option 1 is the correct answer.