A passenger travels on a train traveling at a speed of 60 km / h and sees that an oncoming train passes the window for 4 s

| January 11, 2021 | education

A passenger travels on a train traveling at a speed of 60 km / h and sees that an oncoming train passes the window for 4 seconds. What is the speed of an oncoming train if its length is 120 meters?

First, you need to determine the speed with which the oncoming train passed the passenger.
To do this, we divide the length of the train by the time for which it traveled. We get:
120/4 = 30 m / s.
We translate this speed in km / h.
Since in 1 km – 1000 meters, and in 1 hour – 3600 seconds, then the train passed at a speed:
30 * 3600/1000 = 108000/1000 = 108 km / h.
This speed is the sum of the speeds of two trains.
To find the speed of an oncoming train, you need to subtract 60 km / h from the approach speed.
108 – 60 = 48 km / h.
Answer: 48 km / h.



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