Tank No 8

The tank is filled by one inlet valve with a flow rate of 12 liters per second in 72 minutes. How long will it take for the tank to fill if we open half an hour after one more inlet?

Correct answer:

t =  51 min

Step-by-step explanation:


t/72+(t-30)/72=1

2t = 102


t = 102/2 = 51

t = 51

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