Sumi can swim 6 kmph in still water If the velocity of the stream be 2 kmph the time taken by her to...........

Quantitative Aptitude ( CCS) Boats and Streams

Sumi can swim 6 kmph in still water. If the velocity of the stream be 2 kmph, the time taken by her to swim to a place 24 km upstream and back, is?

6 hours

5 hours

4 hours

9 hours

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Explanation:

Solution:
Upstream speed = speed of man – speed of stream=6 – 2 = 4
Downstream speed = speed of man + speed of stream=6 + 2=8
Time taken to go upstream = distance/speed = 24/4 =6 hour
Time taken to go downstream = distance/speed =24/8 = 3 hour
Total time =6+3 = 9 hour