Water inlets

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

Correct result:

x =  51 min

Solution:


12•60•72=x•(12•60)+(x-30)•(12•60)

1440x = 73440

x = 51

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