A) \[1\frac{1}{3}\text{h}\]
B) \[2\,\,\text{h}\]
C) \[2\frac{2}{3}\,\,\text{h}\]
D) \[1\frac{2}{3}\,\,\text{h}\]
Correct Answer: A
Solution :
Ratio of speeds = 3 : 4 Ratio of time taken = 4 : 3 Let the time taken by A and B be 4x hour and 3xhour respectively. Then, \[4x-3x=\frac{20}{60}\] \[\Rightarrow \]\[x=\frac{1}{3}\] \[\therefore \]Time taken by A = 4x hour \[=\left( 4\times \frac{1}{3} \right)\text{h}=1\frac{1}{3}\text{h}\]
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