Three pumps are connected in series. According to pump performance curves, the free delivery of each pump

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Three pumps are connected in series. According to pump performance curves, the free delivery of each pump is as follows:

Pump 1: 1600 L/min Pump 2: 2200 L/min Pump 3: 2800 L/min

If the flow rate for this pump system is 2500 L/min, which pump(s) should be shut off?

(a) Pump 1 

(b) Pump 2 

(c) Pump 3 

(d) Pumps 1 and 2

(e) Pumps 2 and 3

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