Question

A train 270 m long is running at 80 km/hr. How much time will it take to cross a
platform 130 m long?​

Answer 1

Answer:

18 sec.

Step-by-step explanation:

Given

Distance of platform  = 130 m

Distance of train = 270 m

Actual distance = 130 + 270 = 400 m .

Speed = 80 km / hr

Here speed is in km / hr.

$\large \text{Convert it into m/sec \ by \ multiplying \ \dfrac{5}{18} }$

$\large speed =80 \times\dfrac{5}{18} \ m/sec\\\\\\\large speed = \dfrac{400}{18} \ m/sec$

Now we know formula for time

$\large Time =\dfrac{Distance}{Speed}$

put the value here we get

$\large \text{ Time =\dfrac{400}{\dfrac{400}{18} } \ sec }\\\\\\\large Time = 400\times \dfrac{18}{400} \ sec\\\\\\\large Time =18 \ sec$

Thus we get answer.