Pumps

Pump drawing water at velocity 3.5 liters per second from a construction trench takes 35 minutes.

a) Find out how many minutes the water would run out of the trench pump that draws 7.4 liters of water per second.
b) What pumping velocity would you have had to pump that water from the trench after a maximum of 25 minutes?

Correct answer:

t2 =  16.55 min
v3 =  4.9 l/s

Step-by-step explanation:

v1=3.5 l/s t1=35 min s=35 60  s=2100 s v2=7.4 l/s  Q = v1 t1 = v2 t2  T2=v2v1 t1=7.43.5 2100=3736750993.2432 s t2=T2 min=T2:60  min=993.2432:60  min=16.55 min=16.55 min
t3=25 min s=25 60  s=1500 s  v1 t1 = v3 t3  v3=t3v1 t1=15003.5 2100=4.9 l/s



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