In takes one machine 4 hours to complete a production order and another machine 3 hours to complete the same order. How many hours would it take when both machines complete the order simultaneowsly at their respective rates?
A. ক \(\frac{7}{12}\)
B. খ \(\frac{3}{2}\)
C. গ \(\frac{12}{7}\)
D. ঘ \(\frac{7}{2}\)
সঠিক উত্তরঃ
C.
গ \(\frac{12}{7}\)
Explanation:
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