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 is the pumping velocity you would 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:

Q=v1t1=v2t2  t2=v2v1t1=7.43.535=16.55 min 
v1t1=v3t3  v3=v1t3t1=3.52535 v3=4.9 l/s

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