Question

A train 300m long is running at a speed of 90km/hr. how many seconds will itbtake to cross a 200 m long train

Answer 1

Hello,

Length of train = 300 m

Length of another static train = 200m

Now ,total distance travelled by train a is=
Length of train b + length of train a
So
Distance travelled by train a is
300 +200 = 500 m

Speed of the train is 90km/hr
Or in si unit = 90*5/18 = 25 m/sec

So
We know that
$time = \frac{d}{speed} \\ \\ time = \frac{500}{25} = 20 \: seconds$
So,

The train( a) will take 20 seconds to cross another train

Answer 2

ans is 20 s by shortest method