Karim can do a job in 15 minutes and his brother takes twice as long to do the same job. If they work together, how long it takes to complete the job?
Created: 6 years ago |
Updated: 2 years ago
best des
If Karim takes 15 minutes then his brother takes 2 x 15 = 30 minutes to do the job.
Together they can complete 1/15 + 1/30 = 3/30 = 1/10 of the job in a minute.
So, together they can complete the job in 10 minutes.
Md Azizur Rahman
Founder of Satt
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