Question
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
A. 12 minutes
B. 15 minutes
C. 21 minutes
D. 23 minutes
E. 28 minutes
Answers
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
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
Tony fills 1/6 in a quarter hour, not 1/4
1/2 + 1/3 +1/6 = 1 pool
1/2 + 1/3 +1/6 = 1 pool
Related Questions
Jim can fill a pool carrying bucks of water in 30 minutes. Sue can do the same job in 45 minutes. To...
Jim can fill a pool carrying buckets of water in 30 minutes. Sue can do the same job in 45 minute...
Jim can fill a pool carrying buckets of water in 30 minutes. Sue can do the same job in 45 minutes....