or
or
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
আপনি আমাকে যেকোনো প্রশ্ন করতে পারেন, যেমনঃ
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