A) 127
B) 121
C) 117
D) 108
Correct Answer: C
Solution :
[c] Let the speed of the train be \[x\,km/h.\] Then, relative speed of the train and man \[=(x+9)\,km/h\] \[\text{Speed=}\frac{\text{Distance}}{\text{Time}}\] \[\Rightarrow \] \[x+9=\frac{210}{6}\times \frac{18}{5}\] \[\Rightarrow \] \[x+9=126\] \[\therefore \] \[x=117\] |
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