A 250 m train travels through a 2km tunnel at 27 km/hr. How long is it from

the time the front of the train enters the tunnel, to when it completely leaves

it?

ueshui Apr 11, 2020

#1**+2 **

A 250 m train travels through a 2km tunnel at 27 km/hr. How long is it from

the time the front of the train enters the tunnel, to when it completely leaves

it?

**Hello Guest!**

\(v=\frac{s}{t}\\ t=\frac{s}{v}\\ s=2km+250m\\ s=2250m\)

\(v=\frac{27km}{h}\cdot \frac{h}{3600sec}\cdot \frac{1000m}{km}\\ v=7.5\frac{m}{sec}\)

\(t=\frac{s}{v}=\frac{2250m\cdot sec}{7.5m}\)

\(t=300sec\cdot\frac{1min}{60sec}\)

\(t=5min\)

The train is in the tunnel for 5 minutes.

!

asinus Apr 11, 2020