An outlet pipe empties a tank which is full in 10 hours. If the inlet pipe is kept open, which lets liquid in at the rate of 8 litres/min then outlet pipe would take 6 hours longer. Find the capacity of the tank. Choose the most appropriate option:
A) 8600 litres
B) 12800 litres
C) 12100 litres
D) 11200 litres
E) 13200 litres
Let the rate of outlet pipe be x liters/hour;   Rate of inlet pipe is 8 litres/min, or  8*60= 
<gadget id="calculator"> 8*60</gadget>
<output>480</output>
480 liters/hour;   Net outflow rate when both pipes operate would be x-480 liters/hour.   Capacity of the tank= x*10 hours = (x-480)*(10+6) hours   10x=(x-480)*16 --&gt; x=1280 --&gt; capacity = 10x = 12800 liters.   Answer: 12800 litres
<result>B</result>
An outlet pipe empties a tank which is full in 10 hours. If the inlet pipe is kept open, which lets liquid in at the rate of 8 litres/min then outlet pipe would take 6 hours longer. Find the capacity of the tank.