Question

train 10 metre long​

Answer 1

Answer:

90 sec

Explanation:

let the time taken by train be x second

total distance travelled by train to cross river bridge =800m+100m=900m

speed of train=36km/hr

here,

1 km/hr =5/18 m/s

so, 36 km/hr= 36*5/18 m/s= 10 m/s

now ,

speed =distance/time

10m/s=900m/x

10*x m/s=900 m

x = 900/10 s

x= 90 s.

Hence, trian will take 90s to cross the bridge.