Posted by sharon on Thursday, March 19, 2009 at 10:46pm.
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

math  Damon, Thursday, March 19, 2009 at 11:42pm
Jim 1/30 pools per minute
Sue 1/45 pools/min
Tony 1/90 pools/ min
Total = 3/90 + 2/90 + 1/90 = 6/90 = 1/15 pools/min
(1/15) pools /min * t = 1 pool
t = 15 min

math  Damon, Thursday, March 19, 2009 at 11:47pm
Tony fills 1/6 in a quarter hour, not 1/4
1/2 + 1/3 +1/6 = 1 pool
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