Pumping

The tank is filled with a larger pump in 12 hours and with a second pump in 15 hours. For how long does the tank fill when both pumps are switched on at the same time?

Correct answer:

t =  6.6667 h

Step-by-step explanation:

a=1/12=1210.0833 b=1/15=1510.0667 t=1/(a+b)=1/(0.0833+0.0667)=6.6667 h



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