3 small pumps and a large pump are filling a tank. Each of the three s – McqOptions

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1.	3 small pumps and a large pump are filling a tank. Each of the three small pumps works at 2/3rd the rate of the large pump. If all 4 pumps work at the same time, they should fill the tank in what fraction of the time that it would have taken the large pump alone?
A.	4/7
B.	1/3
C.	2/3
D.	3/4
Answer» C. 2/3

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