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Question

Tap ‘A’ and tap ‘B’ can fill a tank in 45 hours and 35 hours, respectively. If both taps are opened together, then find the time after which tap ‘A’ must be closed so the whole tank can be filled in 21 hours.

A 16 hours

B 18 hours

C 14 hours

D 32 hours

E 12 hours

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