Pipes A and B can fill a cistern in 15 hours together.
Question 1:
Pipes A and B can fill a cistern in 15 hours together. But ifthese pipes operate separately A takes 40 hours less than Bto fill the tank. In how many hours the pipe A will fill thecistern working alone?
A.60
B.20
FeedbackLet A takes x hours, then B = (x+40) hours 1/x + 1/x+40 = 1/15 x = 20
C.40
D.15
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