Question

A pipe can fill a cistern in 12 min
and another pipe can fill it in
15 min, but a third pipe can empt
it in 6 min. The first two pipes are
kept open for 5 min in the
beginning and then the third pipe
is also opened. Time taken to
empty the cistern is​

Answer 1

Answer:

Let the capacity of the tank = LCM of (12,15, 6) = 60 litres.Rate of work done by the first pipe = 60/12 5 L/minRate of work done by the second pipe = 60/15 4L/minRate of work done by the draining pipe = 60/610L/minIf all the pipes are opened simultaneously, (5+4-10) litres will be filled in a minute.Since this comes out to be negative, no water will be filled at any point of time.

Step-by-step explanation: