If the ratio of speed of doing work of the persons is 1 : 3 : 5 , what is the ratio of this taken by these people to do the same amount of work ?
A. 15 : 5 : 3
B. 15 : 5 : 7
C. 3 : 15 : 5
D. 15 : 3 : 5
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সঠিক উত্তরঃ
A.
15 : 5 : 3
Explanation:
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