A cistern has two inlets A and B which can fill it in 12 minutes and 15 minutes respectively. An outlet C can empty the full cistern in 10 minutes. If all the three pipes are opened together in the empty tank, how much time will they take to fill the tank completely?
Share
time taken by inlet B to fill is 15mins
time taken by inlet C to empty is 10mins
in 1 min each inlet fill or empty water
1/12 ; 1/15 and 1/10 respectively
1/12 + 1/15 - 1/10
(5+4-6)/60
3/60 water is fill
time taken to fill this
60/3 = 20 mins
Answer:
20 mins
Step-by-step explanation:
time taken by inlet A to fill 12mins
time taken by inlet B to fill is 15mins
time taken by inlet C to empty is 10mins
in 1 min each inlet fill or empty water
1/12 ; 1/15 and 1/10 respectively
1/12 + 1/15 - 1/10
(5+4-6)/60
3/60 water is fill
time taken to fill this
60/3 = 20 mins