One tap can fill a cistern in 2 hours and another tap can empty the cistern in 3 hours. How long will they take to fill the cistern if both the taps are opened ?
A. 5 hrs
B. 7 hrs
C. 6 hrs
D. 8 hrs
Answer:C
One tap can fill a cistern in 2 hours and another tap can empty the cistern in 3 hours. How long will they take to fill the cistern if both the taps are opened ?
A. 5 hrs B. 7 hrs C. 6 hrs D. 8 hrs
Explanation: Net part filled in 1 hour = (1/2) - (1/3) = 1/6