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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
Feedback Let 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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