A can fill a tank in 15 minutes and B can fill it in 30 minutes. C can make it empty@12 Ltr/min. If all 3 are open at same time when tank was empty. After 30 minutes tank becomes completely empty find capacity of tank.

a) 360
b) 270
c) 180
d) 120
e) 90

Jim can fill a pool carrying bucks of water in 30 minutes. Sue can do the same job in 45 minutes. Tony can do the same job in 1 ½ hours. How quickly can all three fill the pool together?

a) 12 minutes
b) 15 minutes
c) 21 minutes
d) 23 minutes
e) 28 minutes