A tap is filling a 10-liters tank at the speed of 5 liters per minute.
A hole locates at the bottom of the tank which leaks water at
the speed of 1 liter per minute. It takes — minutes to fill the
tank.

Explanation:

The net speed or net rate for filling the 10-liters tank is equal to the speed the tap is filling less the speed the water is leaking through the hole located at the bottom of the tank:

Thus, consiedering the tank is empty at the beginning, the time is:

x+y=90

x=30-y=x

step-by-step explanation:

if you understand you will get the answer

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step-by-step explanation: