Question

Three pipes A, B and C can fill a cistern in 4, 8 and
12 hours respectively, while another pipe D can alone
empty it in 10 hours. Then which of the following
arrangements will fill the cistern in the least possible
time?
a) B alone is opened
b) A and D are opened
c) A, C and D are opened
d) B, C and D are opened
ANSWER FAST​

Answer 1

Answer:

option d is correct

Step-by-step explanation:

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