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A man can swim 3 km/hr in still water. I...

A man can swim 3 km/hr in still water. If the velocity of the stream be 2 km/hr, the time taken by him to swim to a place 10km upstream and back is:

A

10 hours/10 घंटे

B

12 hours /12 घंटे

C

`8 1/3` hours /`8 1/3` घंटे

D

`9 1/8` hours /`9 1/3` घंटे

Text Solution

Verified by Experts

The correct Answer is:
B
धारा के विरुद्ध 10 km जाने में लगा समय `= 10/((3-2))=10 hr`
10 km धारा के साथ आने में लगा समय `= 10/(3+2) = 2hr`
`:. " आने तथा जाने में लगा कुल समय " = 10+2 = 12 hr`
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