Simultaneously 17821

The reservoir is filled with the first pump in 30 hours, the second in 24 hours, and the third in 20 hours. How long does it take to fill the reservoir if all pumps are switched on simultaneously?

Correct answer:

t =  8 h

Step-by-step explanation:

t · (1/30+1/24+1/20)=1

15t = 120

t = 120/15 = 8

t = 8

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