A) 2 : 1
B) 1 : 2
C) 4 : 1
D) 1 : 4
Correct Answer: D
Solution :
Given, \[\frac{{{r}_{1}}}{{{r}_{2}}}=\frac{2}{1}\] \[\therefore \] \[\frac{\text{Area of drum Ist }\!\!~\!\!\text{ }\!\!~\!\!\text{ }}{\text{Area of drum IInd}}=\frac{\pi r_{1}^{2}}{\pi r_{2}^{2}}=\frac{4}{1}\] But times taken will be inversely proportional to the area, therefore required ratio is 1 : 4.You need to login to perform this action.
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