Question

a 250 m long train is moving at aconstant speed of 72km/hr .how much time will it take to cross a bridge 150m long?​

Answer 1

It will take 20 seconds to cross the bridge.

Step-by-step explanation:

Speed of the train = 72 km per hour

∵ 1 km = 1000 meter

∴ 72 km = 72 × 1000 = 72,000 meter

1 hour = 3600 seconds

Speed of the train =  = 20 meter/sec.

distance covered by train = length of the train + length of the bridge.

distance covered = 250 + 150

                            = 400 meter

Speed =   $\frac{distance}{time}$

Let the time taken by the train  t sec.

$20=\frac{400}{t}$

20t = 400

t =  $\frac{400}{20}$

t = 20

It will take 20 seconds to cross the bridge.

Learn more speed time : brainly.in/question/15741316

Answer 2

Step-by-step explanation:

Sorry For Scratches .

Pls Mark It As A Brainlist Answer. (-:||:-)