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Two pipes A and B together can fill a ci...

Two pipes A and B together can fill a cistern in 4 hours. Had they been opened separately, then B would have taken 6 hours more than A to fill the cistern. How much time will be taken by A alone to fill the cistern? `1\ h r s` b. `2\ h r s` c. `6\ h r s` d. `8\ h r s`

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