Sun	Mon	Tue	Wed	Thu	Fri	Sat
30	31	1	2	3	4	5
6	7	8	9	10	11	12
13	14	15	16	17	18	19
20	21	22	23	24	25	26
27	28	29	30	1	2	3
4	5	6	7	8	9	10

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Multiple Choice Questions

Time taken to cover the upstream distance on Thursday is 12 hours more than time taken to ...........

Quantitative Aptitude (CPO) Boats and Streams

Study the following pie-chart and table carefully and answer the questions that follow:
Some values are missing. Answer the questions on the basis of given table and information in question. Speed of stream is same for both upstream and downstream distance on respective days.

Time taken to cover the upstream distance on Thursday is 12 hours more than time taken to cover the downstream distance on Friday. Total speed of still water on Thursday and Friday is 11 km/hr. Find the ratio of speed of still water on Thursday and Friday.

6 : 7

4 : 5

7 : 9

5 : 6

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Explanation:

Let speed of still water upstream on Thursday = x, then downstream on Friday = (11-x)
Now
45/(x-2.5) – 54/[(11-x)+3)] = 12
15/(x-2.5) – 18/(14-x) = 4
The time is integral value, so by putting values higher than 2.5, x can be found
x = 5
So required ratio is 5 : 6

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