# math

posted by
**sharon** on
.

Jim can fill a pool carrying buckets 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