Q : Two pipes A and B can fill a cistern in 75/2 minutes and 45 minutes respectively. Both pipes are opened. The cistern will be filled in just half an hour, if the B is turned off after :
A : 7 min
B : 6 min
C : 8 min
D : 9 min
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c:8 min is the answer
chris43:
hi
yes
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