A train is traveling at a speed of 162 km/h and crosses a telegraph post in 27 seconds.  How long will the train take to cross a bridge which is 90 m long?please give ans with proper explanation ​

  • matematika

    Subject:

    Math
  • Author:

    maddie
  • Created:

    1 year ago

Answers 1

Answer:

Step-by-steLet the length of the bridge be x metres and length of the first train at 90 km/hr be y metres

Then (x+y)=[(90×

18

5

)×36] m =900 m

The second train crosses the bridge by covering  distance of [x+(y−100)]m at the rate of 45 km/hr

12.5 m/s i.e. 800 m at 12.5 m/s (∵x+y=900 m)

Time taken by the second train to cross the bridge =

12.5

800

 sec =64 secondsp explanation:

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