Question

a train 450 M long moving with a uniform speed of 90 km per hour crosses a pole how long will it take to cross the pole​

Answer 1

$\mathfrak{\huge{Answer:}}$

We can either convert both the values in metres or in kilometres. We'll do it both the ways :

$\bold{\sf{Method1}}$

Convert 450 m into km =》 $\tt{0.45}$ km

Speed given is =》 90 km/hr

We know that the time is :

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

Time = $\sf{\frac{0.45}{90}}$

Time = 0.005 hours

$\bold{\sf{Method2}}$

Convert speed, which is 90 km/hr into m/s =》 $\tt{25}$ m/s

Distance given is =》 450 m

We know that the time is :

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

Time = $\sf{\frac{450}{25}}$

Time = 18 seconds

Thus, in hours, the value is $\mathfrak{0.005\:hours}$ and in seconds, the value is $\mathfrak{18\:seconds}$