Question :
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 to fill the cistern separately?
1. 1 hour
2. 6 hour
3. 8 hour
4. 11 hour
Answer :
2 - 6 hour
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