Question

A train 210 m long took 12 seconds to pass a 90 m long tunnel. Find the speed of the train
Direct and inverse variation

Answer 1

speed of the train = $\frac{distance}{time}$
speed = $\frac{210+90}{12}$
speed = $\frac{300}{12}$
speed of the train = 25 m/s

Answer 2

Answer:

The speed at which the train crosses the tunnel is 25 m/s

To find:

The speed at which the train is crossing the tunnel

Solution:

Given that

Length of the Train = 210 m

Length of the Tunnel = 90 m

Time taken by the train to cross the tunnel =12 seconds

Speed can be calculated by using the following formula,

$\text { Speed } = \frac { \text { Distance } } { \text { Time } }$

When we are considering two lengths, the distance can be found out by adding both lengths together.

$\begin{array} { c } { = \frac { ( 210 + 90 ) } { 12 } m / s } \\\\ { = \frac { 300 } { 12 } } \\\\ { = 25 \mathrm { m } / \mathrm { s } } \end{array}$

Speed at which the train is crossing the tunnel = 25 m/s.