How many seconds will a 400 meter long train take to cross a man walking with a speed of 3 km/hr in ...
How many seconds will a 400 meter long train take to cross a man walking with a speed of 3 km/hr in the direction of the moving train if the speed of the train is 63 km/hr?
Answer/Solution
900
Steps/Work
Let length of tunnel is x meter
Distance = 400+x meter
Time = 1 minute = 60 seconds
Speed = 78 km/hr = 78*5/18 m/s = 65/3 m/s
Distance = Speed*Time
400+x = (65/3) * 60
400+x = 20 * 65 = 1300
x = 1300 - 400 = 900 meters
Answer: C
Distance = 400+x meter
Time = 1 minute = 60 seconds
Speed = 78 km/hr = 78*5/18 m/s = 65/3 m/s
Distance = Speed*Time
400+x = (65/3) * 60
400+x = 20 * 65 = 1300
x = 1300 - 400 = 900 meters
Answer: C