When the train passes through a pole or tower or lightpost or tree or a stationary object
If length of train = x meters and speed of the train = y km/hr, then time taken by the train to pass the stationary object = length of the train/speed of the train = x meters/y km/hr.
Note: Change km/hr into m/sec.
Solved examples to calculate when the train passes through a pole or a stationary object.
1. A train 150 m long is running at a uniform speed of 54 km/hr. How much time will it take to cross a pole?
Solution:
Speed of train = 54 km/hr
= 54 × 5/18 m/sec
= 15 m/sec
Length of the train = 150 meters
Therefore, time taken by the train to cross a pole = length of train/speed of train
= 150/15 sec
= 10 sec
Thus, train takes 10 seconds to cross the pole.
2. Find the time taken by a train 300 m long, running at a speed of 54 km/hr in crossing the pole.
Solution:
Length of the train = 300 m
Speed of the train = 54 km/hr
= 54 × 5/18 m/sec
= 15 m/sec
Therefore, time taken by the train to cross the pole = 300 m/15 m/sec
= 20 seconds.
3. A train is running at a speed of 45 km/hr. It crosses a tower in 8 seconds. Find the length of the train.
Solution:
Speed of train = 45 km/hr
= 45 × 5/18 m/sec
= 25/2 m/sec
Time takes to cross the tower = 8 seconds
Length of the train = speed × time
= 25/2 × 8 m
= 100 m
4. A train is running at a speed of 126 km/hr. if it crosses a pole in just 7 second, what is the length of the train?
Solution:
Speed of the train = 126 km/hr
Speed of the train = 126 × 5/18 m/sec = 35 m/sec
Time taken by the train to cross the pole = 7 seconds
Therefore, length of the train = 35 m/sec × 7 sec = 245 m
`Relationship between Speed, Distance and Time
Problems on Calculating Distance
Two Objects Move in Same Direction
Two Objects Move in Opposite Direction
Train Passes a Moving Object in the Same Direction
Train Passes a Moving Object in the Opposite Direction
Two Trains Passes in the Same Direction
Two Trains Passes in the Opposite Direction
8th Grade Math Practice
From Train Passes through a Pole to HOME PAGE
Didn't find what you were looking for? Or want to know more information about Math Only Math. Use this Google Search to find what you need.

New! Comments
Have your say about what you just read! Leave me a comment in the box below. Ask a Question or Answer a Question.