Mr. Arif can complete a job in 15 minutes, while Mr. Asif takes twice as long to do the same job. If they work together, how many minutes will they require to complete the job?
Created: 6 years ago |
Updated: 2 years ago
best des
In 15 minutes Arif can complete a job
∴ in 1 '' '' '' '' 1/15 part
as, Asif takes twice as long to do the same job, Asif needs (15* 2) = 30 mins
In 30 minutes Arif can complete a job
∴ in 1 '' '' '' '' 1/30 part
together they can work in 1 min (1/15 + 1/30) = 3/30 = 1/10 part
they can do 1/10 part in 1 min
they can do 1 (or whole) part in 10 min
ans: 10 minutes
Md Azizur Rahman
Founder of Satt
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