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Q 2472378236.     Three pipes can fill a tank in 10, 24 and 42 hours. If each pipe is opened for one hour one after the other till the tank gets full, how long (approximately) does it take to fill the tank?

IBPS-CLERK 2017 Mock Mains
A

15 hours

B

16 hours

C

17 hours

D

18 hours

E

19 hours

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