Subject
Bank Exam
Topic
Exim Bank Trainee Officer 2015
Rakib can complete a task in 30 minutes and together with his brother Momin, he can complete the task in 20 minutes. How long would it take for Momin working alone to complete the task?
Rakib can complete a task in 30 minutes and together with his brother Momin, he can complete the task in 20 minutes. How long would it take for Momin working alone to complete the task?
ক)
30 minutesখ)
40 minutesগ)
50 minutesঘ)
60 minutesExplanation
in 30 minutes, Rakib can complete 1 task in 1 minute, Rakib can complete 1/30 task Again, in 20 minutes, Rakib and Monin can complete 1 task in 1 minute, Rakib and Monin can complete 1/20 task Now, let, monin does x task in 1 minute. Now, 1/30 + 1/x = 1/20 (x + 30)/30x = 1/20 30x = 20x + 600 30x - 20x = 600 10x = 600 x = 60 Thus, momin working alone can complete the task in 60 minutes.Related questions
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