| 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 moving train, if the speed of the train is 63 km/h? |
A) 25
B) 30
C) 40
D) 45
Correct Answer: B
Solution :
| Speed of train relative to man \[=(63-3)\,\,km/h\] |
| \[=60km/h=\frac{60\times 5}{18}m/s\] |
| \[=\frac{50}{3}m/s\] |
| \[\therefore \]Time taken to pass the man \[=500\times \frac{3}{50}=30\,\,s\] |
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