A) 7 min
B) 14 min
C) 28 min
D) 63 min
Correct Answer: A
Solution :
Let C's speed be x m/min. Then, B's speed = 3x m/min and A's speed = 6x m/min Ratio of speeds of A and C = Ratio of times taken by C and A A, \[6x:x=42:y\]min \[\Rightarrow \frac{6x}{x}=\frac{42}{y}\] \[\Rightarrow \] \[y=\frac{42}{6}\]min = 7 minYou need to login to perform this action.
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