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Two pipes A and B can fill a tank in 24h...

Two pipes A and B can fill a tank in 24h and 30 h respectively. If both the pipes are opened simultaneously in the empty tank, how much time will be taken by them to fill it? `13\ h\ 20\ m in` b. `12\ h\ 10\ m in` c. `14 h` d. `10 h\ 5\ m in`

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