Five pumps

Three same pumps fill the tank with 50400 liters of diesel in 7 hours. How many liters of diesel will it take in 4 hours if we add two more of the same pumps and pump them the same way?

How much more (or less) will they get if we add 2 of the same pumps and all work for 4 hours?

Correct answer:

V1 =  48000 l
d =  -2400 l

Step-by-step explanation:

V0=50400 l  Q=50400/7/3=2400 l/h  V1=4 (3+2) Q=4 (3+2) 2400=48000 l
d=V1V0=4800050400=2400 l

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