If Carol can finish a job in 5 hours and Steve can finish the same job in 10 hours, how many minutes will it take both of them together to finish the job?
2007-01-28 12:34:39 · 16 answers · asked by Ze'ev X 1 in Science & Mathematics ➔ Mathematics
5 hours.
Steve's sensible, it takes him 10 because he spends 5 hours in the pub first.
By the time he gets back Carol will have finished
SENSIBLE ANSWER
Steve does one job in 10 hours, Carol can do two
That's 3 jobs in 10 hours, so 3 1/3 hours per job
200 minutes
2007-01-28 12:40:26 · answer #1 · answered by Anonymous · 0⤊ 1⤋
First of all I don't think Carol ( a woman) can do something faster then Steve ( a man ). Having said that. Analyze % complete until you reach 100%
e.g. Carol will be 50% complete in 2.5 hours (150 minutes) and
.333333% complete in 1 minute.
Steve can do 50% in 5 hours ( 300 Minutes ) and .1666666% complete in 1 minute.
Assuming that Carol is willing to do more that half ( also an assumption ) Add the 2 together and you get ~.5% per minute means you'd need 200 minutes to get the the whole job done by both.
2007-01-28 12:53:17 · answer #2 · answered by Barry B 2 · 1⤊ 0⤋
You want minutes as the final answer, there are 60 minutes to an hour. In "t "hours 1/5 t+ 1/10 2/10 + 1/10 3/10 of the job is completed in one hour, a complete job is 10/10 3 * t = 10 t = 10/3 hours t = 10/3 hr* 60 min/hr t = 10 * 20 min t = 200 min
2016-03-29 07:07:53 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Carole's rate 1 job in 5 hours or 1/5 - Steve's rate is 1 job in 10 hours or 1/10. Let t = time in hours so 1/5t + 1/10t =1(job) 3/10t =1 and multiplying both sides by the reciprocal of 3/10 you get t = 10/3 or 3 1/3 hours 3 hours and 20 minutes
2007-01-28 13:17:09 · answer #4 · answered by LesW 1 · 0⤊ 1⤋
In ten hours Steve would do one job and carol would do 2
so 3 jobs finished in 600 minutes....or 1 job finished in 200
you're welcome
Just out of curiosity, why did this answer get a thumbs down?
2007-01-28 12:39:28 · answer #5 · answered by ? 4 · 0⤊ 1⤋
Ok, in 10 hours (600 minutes) together they finish 3 jobs, meaning they can finish 1 job in 200 minutes.
2007-01-28 12:42:02 · answer #6 · answered by obelix 6 · 0⤊ 1⤋
50/15=10/3=3+1/3 hours
3+1/3 * 60= 200 minutes...
2007-01-28 12:40:27 · answer #7 · answered by Anonymous · 0⤊ 1⤋
200 minutes
2007-01-28 12:45:05 · answer #8 · answered by aliyyahmeera 1 · 0⤊ 1⤋
440
2007-01-28 12:37:47 · answer #9 · answered by kimmy 2 · 0⤊ 2⤋
15 hours all together
2007-01-28 12:37:23 · answer #10 · answered by Anonymous · 0⤊ 2⤋