A) 5
B) 6
C) 7
D) 12
Correct Answer: C
Solution :
For coming train \[n'=n\left\{ \frac{v}{v-{{v}_{5}}} \right\}\]and for going train" \[=n\left\{ \frac{v}{v+{{v}_{5}}} \right\}\] \[n=n'-n=n\left[ \frac{v}{v-{{v}_{5}}}-\frac{v}{v+{{v}_{5}}} \right]\] =7 (after putting values, Hence, the correction option is [c].You need to login to perform this action.
You will be redirected in
3 sec