Question

In a tank there are four outlets A, B, C and D.
These outlets can empty the tank in 10
minutes, 12 minutes, 15 minutes and 18
minutes respectively. If the tank is full and all
the outlets are opened, then how much time
will it take to empty the whole tank.

Answer 1

Answer:

3 min 16 sec

Step-by-step explanation:

time taken to empty the tank is x

work done by tank A in 1 min is 1/10

similarly,B=1/12

C=1/15

D=1/18

so

eq is

x/10+x/12+x/15+x/18=1

x=180/55

3 min 16 sec