if 2 pipes take an hour to fill a tank, then how long should 8 pipes take to fill the same tank?
Choose the most appropriate option
A) 20 min  B) 10 min  C) 15 min  D) 25 min  E) 30 min
if 2 pipes take an hour to fill a tank, then   8 pipes will take   2*60/8= 
<gadget id="calculator">  2*60/8</gadget>
<output>15</output>
15 mins to dig a ditch of the same type.   ANSWER:15 min
<result>C</result>
if 2 pipes take an hour to fill a tank, then how long should 8 pipes take to fill the same tank?