যদি 12 জন কর্মী সমবেগে 60টি বাক্স 9 মিনিটে মোড়তজাত করতে পারে তবে একই বেগে 27 জন কর্মীর 180টি বাক্স মোড়কজাত করতে কত সময় লাগবে
A. 12
B. 13
C. 14
D. 15
সঠিক উত্তরঃ
A.
12
Explanation:
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