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?
A. 30 minutes
B. 40 minutes
C. 50 minutes
D. 60 minutes
E. None of these
সঠিক উত্তরঃ
D.
60 minutes
Explanation:
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