| How many seconds will a 500 m long train take to cross a man walking with a speed of 3 km/h in the direction of the moving train, if the speed of the train is 63 km/h? |
A) 25
B) 30
C) 40
D) 45
Correct Answer: B
Solution :
| Relative speed of train \[=\,63-3=60\,km/h\] |
| \[=60\times \frac{5}{18}m/s\] |
| \[\therefore \] \[\text{Time}=\frac{\text{Length}\,\text{of}\,\text{train}}{\text{Relative}\,s\text{peed}}=\frac{500\times 18}{60\times 5}=30\,s\] |
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