a cistern can be filled by one tap in 4 hours and by another tap in 5 hours . in how much time will the cistern be filled , if both taps opened together
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Answer:
Time taken by A and B to fill the cistern = 2 hours 40 minutes
Step-by-step explanation:
Time taken by tab A to fill the cistern = 8 hours
Time taken by tap B to fill the cistern = 4 hours
Work done by type A in 1 hour = ⅛
Work done by type B in 1 hour = ¼
Work done by (A+B) in 1 hour = (⅛ + ¼) = ⅜
Time taken by (A+B) to fill the cistern = 8/3 hours = 2 hours 40 minute.
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