Simultaneously 39941

The reservoir is filled with a large pump in 20 hours, a medium in 24 hours, and a small one in 30 hours. How many hours will it be filled if all pumps are switched on simultaneously?

Correct answer:

t =  8 h

Step-by-step explanation:

T1=20 h T2=24 h T3=30 h  t (1/T1+1/T2+1/T3)=1 t (1/20+1/24+1/30)=1  15t=120  t=15120=8  t=8=8 h

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