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A tap can fill a tank in 6 hours. After ...

A tap can fill a tank in 6 hours. After half the tank is filled, three more similar taps are opened. What is the total time taken to fill the tank completely? `3\ h r s .15\ m in` b. `3\ h r s\ 45\ m in` c. `4\ h r s` d. `4\ h r s\ 15\ m in`

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