A passenger train travels at a speed of 72km/h. a man on the passenger train observes a goods train travelling at a speed of 54 km/h in the opposite direction. If the goods train passes him in 8 seconds. Find the length of the goods train.
Answers
Answer:
The speed of the passenger train is 72 km/h = 20 m/s.
The speed of the goods train is 54 km/h = 15 m/s.
The passenger is moving with the speed 20 m/s + 15 m/s = 35 m/s relative to the goods train (since the trains moves in opposite directions).
Hence, the passenger sees the goods train before his own eyes during L/20+5 seconds, where L is the length of the goods train.
So, your equation is
L/35 = 8,
which gives the length of the goods train L = 8*35 = 280 m.
Answer. The length of the goods train is 280 m.
Answer:
280 m
Step-by-step explanation:
first we will find the relative velocity of the second train .
so Relative Velocity (v) = ( 72 + 54 ) = 126 km/h
then we wil change the unit of v
so,
126 km/h = (126000/3600)m/s = 35 m/s
And we know that ( s = v × t )
where "s" stands for the length of the train and "t " is the given time .
then s = 35 m/s × 8 s = 280 m