On Friday if ratio of speed of boat to speed of stream is 2 1 what is the difference between the tim...........

Quantitative Aptitude ( CCS) Data Table

Direction : Study the following table to answer the questions that follow. Some values are missing. Study the table carefully and answer the questions based on data in table and particular questions.

On Friday, if ratio of speed of boat to speed of stream is 2 : 1, what is the difference between the time taken by the boat to go upstream and the time taken by the boat to go downstream?

36 hours

54 hours

45 hours

72 hours

65 hours

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Explanation:

Speeds = 2a, a
So
324/(2a+a) + 324/(2a-a) = 72
Solve, a = 6
So speed of stream is 6 km/hr and speed of boat is 12 km/hr
So difference in time = 324/(12-6) – 324/(12+6) = 54 – 18 = 36 hours

Hence, option 1 is the correct answer.