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Directions : 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 Friday is same as time taken to cover the downstream distance on Thursday. Total speed of still water on Thursday and Friday is 10 km/hr. Find the ratio of speed of still water on Thursday and Friday.
6 : 13
4 : 11
7 : 13
4 : 15
7 : 12
Distances upstream: Monday = 18/100 * 150 = 27 km, Tuesday = 12/100 * 150 = 18 km.
Wednesday = 39 km, Thursday = 45 km, Friday = 21 km Similarly Distances downstream: Monday = 27 km, Tuesday = 45 km.
Wednesday = 18 km, Thursday = 36 km, Friday = 54 km Let speed of still water upstream on Friday = x,
then downstream on Thursday = (10-x) Now 21/(x-3) = 36/[(10-x)+2.5)] Solve, x = 6.5 So required ratio is 3.5 : 6.5 = 7 : 13
Hence, option 3 is the correct answer.
By: Amit Kumar ProfileResourcesReport error
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