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Tap a fills a tank in 10 hours and B can...

Tap a fills a tank in 10 hours and B can fill it in 15 hours. Both are opened simultaneously. Sometimes later tap B was closed, then it takes total 8 hours to fill up tank. After how many hours B was closed?

A

2

B

3

C

4

D

5

Text Solution

Verified by Experts

The correct Answer is:
B
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