Question

250 m long train speeds past a pole in 12 seconds ,what speed in km /hr​

Answer 1

Answer:

75km/hr

Step-by-step explanation:

S=d/t

So

S=250/12×18/5

S=72km/hr

Answer 2

Answer:

75 km / hr.

Step-by-step explanation:

We know that speed is nothing but it is distance covered by body in unit

time..

$\large speed=\dfrac{distance}{time}$

we have to find here speed.

Given :

Distance is 250 m  and time is 12 second.

putting values in formula we get

$\large speed=\dfrac{250}{12} \ m/sec\\ \\\\\\\large \text{But we have to find in km/hr so multipy by \dfrac{18}{5} }\\\\\\\large speed=\dfrac{250}{12}\times \dfrac{18}{5} \ km/hr\\\\\\\large speed=\dfrac{250}{2}\times \dfrac{3}{5} \ km/hr\\\\\\\large speed=\dfrac{250\times3}{10} \ km/hr\\\\\\\large speed=25\times3 \ km/hr\\\\\\\large speed=75 \ km/hr$

Thus speed of train is 75 km /hr.