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RRB NTPC CBT I 29 Dec 2020 Shift 2 Paper

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Question : 9

Total: 100

There pipes, A and B and C, can fill a tank in 15 hours, 12 hours, and 18 hours, respectively. If both pipes A and C are opened simultaneously into the empty tank, then the time taken (in hours) to fill the tank will be:

8‌
2
11
6‌
5
9
7‌
2
3
9‌
3
5

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