218. 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 cistern. How much time will be taken by A to fill the cistern separately?

A. 1 hr
B. 2 hrs
C. 6 hrs
D. 8 hrs
✅ The correct answer is option C. 6 hrs.

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