Two trains

The train runs at speed v1 = 72 km/h. The passenger, sitting in the train, observed that a train long l = 75m in 3 s passed on the other track in the opposite direction. Calculate the speed of this train.

Correct answer:

v2 =  18 km/h

Step-by-step explanation:

v1=72 km/h m/s=72:3.6  m/s=20 m/s l=75 m t=3 s  t=v1+v2l  v1 t+v2 t=l  v22=tlv1 t=37520 3=5 m/s  v2=v22 km/h=v22 3.6  km/h=5 3.6  km/h=18 km/h=18 km/h



Did you find an error or inaccuracy? Feel free to write us. Thank you!










Tips to related online calculators
Do you have a linear equation or system of equations and looking for its solution? Or do you have a quadratic equation?
Do you want to convert length units?
Do you want to convert velocity (speed) units?
Do you want to convert time units like minutes to seconds?

You need to know the following knowledge to solve this word math problem:

Related math problems and questions: