A pipe takes a hours to fill the tank. But because of a leakage it took 7 times of its original time. Find the time taken by the leakage to empty the tank	Choose the correct choice from the following:  A) 50 min  B) 60 min  C) 90 min  D) 80 min  E) 70 min
pipe a can do a work 60 min.   lets leakage time is x;   then   1/60 -1/x=1/420   x=70 min   ANSW70 minR:70 min
<result>E</result>
A pipe takes a hours to fill the tank. But because of a leakage it took 7 times of its original time. Find the time taken by the leakage to empty the tank