Question

Two pipes can fill the cistern and 10 hours and 12 hours respectively while the third empty it in 20 hours if all types are opened simultaneously then the centre will be filled in

Answer 1

Step-by-step explanation:

total capacity of cistern is

lcm of 10,12,20 that is 60 unit's

first pipe can fill cistern in one hour is 6 unit's

lly second pipe is 5 unit's

both 1+2=11 unit's per hour

third pipe can empty the cistern is 3 unit's per hour

all the pipes are opened simultaneously

6+5-3=8 unit's filled per hour

then total cistern filled in

60/8=7(4/8)

=7(1/2) hour s.