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?

A 10
B 12
C 9
D 8

Correct Answer: 10

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
Bissoy MCQ
#গণিত #Mercantile Bank Ltd #Mercantile Bank Ltd - Officer - 2004

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