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msdevdev777
07.12.2019 •
Mathematics
Phil can paint the garage in 12 hours and rick can o it in 10 hours. if they work together for 3 hours and then phil leaves, how long will it take rick to finish the job?
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Ответ:
It will take 4.5 hours for rick to complete the job.
Step-by-step explanation:
Given:
Time taken by Phil to paint the garage = 12 hours.
It means that for each hour he does =
of the job.
.
Time taken by Rick to paint the garage = 10 hours.
It means that for each hour he does =
of the job
.
If they work together for 3 hours,
Phil does job in 3 hrs =![3\times\frac{1}{12} = \frac{1}{4}=0.25](/tpl/images/0407/4790/c43e6.png)
Rick does job in 3 hrs =![3\times\frac{1}{10} = \frac{3}{10}=0.3](/tpl/images/0407/4790/eab85.png)
.
So in three hours of working together job done =![0.3+0.25 = 0.55](/tpl/images/0407/4790/55088.png)
.
This means job of the painting entire garage have been done 0.55 of it.
1 - 0.55 = 0.45.
So there is 0.45 job left
At this point Phil quits and Rick presses on by himself. Since he does 1/10 of the garage every hour
Let T represents the time that Rick needs to complete the job after Phil leaves.
Hence,![\frac{1}{10}\times T= 0.45\\\\T = 0.45 \times 10\\T =4.5 hrs](/tpl/images/0407/4790/c2c5b.png)
Hence it will take rick 4.5 hours to complete the remaining job.
Ответ:
10
Step-by-step explanation:
39.8/4=9.95, rounds to 10