Water inlets

An Inlet valve with a flow rate of 12 liters per second is filled tank for 72 minutes. How long does it take to fill the full tank if we open one more such valve half an hour after?

Correct answer:

x =  51 min

Step-by-step explanation:


1440x = 73440

x = 73440/1440 = 51

x = 51

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