Three pumps

The water tank is emptied with the first pump in 6 hours, with the second pump in 2 hours. In order to be emptied in 1 hour, all three pumps had to be started at once. How long will it take to empty the tank by only the third pump?

Correct answer:

c =  3 h

Step-by-step explanation:

1 (1/6+1/2+1/c)=1 c/6+c/2+1=c 0.333333c=1 31c=1 c=3=3 h

c/6 + c/2 + 1 = c

2c = 6

c = 6/2 = 3

c = 3

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