Double-track line

A 160 m long passenger train runs on a double-track line in one direction at a constant speed of 54 km/h, and a 240 m long express train in the opposite direction.

a) How fast is the express train if passing the passenger train driver for 6 s?
b) How long does the passenger train pass the express train driver?

Correct answer:

v2 =  90 km/h
t2 =  4 s

Step-by-step explanation:

s1=160 m s2=240 m v1=54 km/h m/s=54:3.6  m/s=15 m/s t1=6 s  s2=(v1+V2) t1 240=(15+V2) 6  6V2=150  V2=25  v2=V2 km/h=V2 3.6  km/h=25 3.6  km/h=90 km/h=90 km/h
s1=(v1+V2) t2  t2=v1+V2s1=15+25160=4 s

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?

Related math problems and questions: