An outlet pipe empties a tank which is full in 10 hours. If the inlet pipe is kept open, which lets water in at the rate of 16 litres/min then outlet pipe would take 8 hours longer. Find the capacity of the tank.	Choose the correct choice from the following choices
A) 8600 litres	B) 200 litres	C) 21600 litres	D) 11200 litres	E) 13200 litres
Let the rate of outlet pipe be x liters/hour;   Rate of inlet pipe is 16 litres/min, or  16*60= 
<gadget id="calculator"> 16*60</gadget>
<output>960</output>
960 liters/hour;   Net outflow rate when both pipes operate would be x-960 liters/hour.   Capacity of the tank= x*10 hours = (x-960)*(10+8) hours   10x=(x-960)*18 --&gt; x=2160 --&gt; capacity = 10x = 21600 liters.   Answer: 21600 litres.
<result>C</result>
An outlet pipe empties a tank which is full in 10 hours. If the inlet pipe is kept open, which lets water in at the rate of 16 litres/min then outlet pipe would take 8 hours longer. Find the capacity of the tank.