Correct Answer - Option 4 : 80 km
Given:
A train running at 60 km/hr crosses a man walking in the same direction as the train at speed of 20 km/hr in 2 hours.
Concepts used:
Relative speed in same direction = Speed of train – Speed of man
Distance = Speed × time
Calculation:
Relative speed in same direction = Speed of the train – Speed of the man
⇒ 60 km/hr – 20 km/hr = 40 km/hr
Distance = Speed × time
⇒ 40 km/hr × 2 hours
⇒ 80 km
∴ The initial distance between train and man 80 km.
