A) \[\frac{5}{4}km\]
B) \[\frac{7}{4}km\]
C) \[\frac{9}{4}km\]
D) \[\frac{11}{4}km\]
Correct Answer: B
Solution :
[b] Let the required distance be x km. Then, \[\frac{x}{(5/2)}-\frac{x}{(7/2)}=\frac{12}{60}\] [\[\therefore \] Difference between two times is 12 min] \[\Rightarrow \] \[\frac{2x}{5}-\frac{2x}{7}=\frac{1}{5}\] \[\Rightarrow \] \[14x-10x=7\] \[\Rightarrow \] \[4x=7\] \[\Rightarrow \] \[x=\frac{7}{4}\] Required distance \[=\frac{7}{4}\,km\] |
You need to login to perform this action.
You will be redirected in
3 sec