Question

a train 210 M long took 12 seconds to pass A 90 metre long tunnel find the speed of the pain​

Answer 1

Give that ,

" A train 210 m long took 12 seconds to pass A 90 metre long tunnel "

We need to find the speed of the train .

Here ,

Time , t = 12 s

Distance , d = Length of train + Length of tunnel

⇒ d = 210 m + 90 m

⇒ d = 300 m

Speed of train , s = ? m/s

$\bf Speed=\dfrac{Distance}{Time}\\\\\implies Speed=\dfrac{300}{12}\\\\\implies Speed=25\;m/s$

So the speed of the train is 25 m/s.