A) 7 min
B) 14 min
C) 28 min
D) 63 min
Correct Answer: A
Solution :
[a] Let Cs 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 \[6x:x=42:y\min \] \[\Rightarrow \] \[\frac{6x}{x}=\frac{42}{y}\] \[\Rightarrow \] \[y=\frac{42}{6}\,\min =7\min \] |
You need to login to perform this action.
You will be redirected in
3 sec