Question

A cistern can be filled by one pipe in 36 minutes and emptied by another pipe in 48 minutes. If both the pipes are opened together, in how much time will the cistern be filled?

Answer 1

Step-by-step explanation:

time taken by pipe 1= 36 min

time taken by pipe 2= 48 min

water emptied by both pipe in 1 min=1/36+1/48

l.c.m of 36 and 48=144

4+3/144=7/144

so,total time taken by is reciprocal of 7/144

=144/7

Answer 2

Answer:

144min

Step-by-step explanation:

in one min it fills 1/36

in one min it emptied 1/48

when both the pipes are open then it fills in one min (1 \div 36) - (1 \div 48)

=1/144

I.e . in 144min the cistern can fill