Question

A train travelling 40 km per hour crosses a signal post in 30 seconds it passes a platform in 45 seconds find the length of platform

Answer 1

First we have to find the length of train

Time = 30s

Speed = 40 km/h = 11.11 m/s

Distance = Speed * Time

               = 11.11  *  30

                = 333.3 m

Length of train = 333.3 m

Now we have to find length of bridge

Let length of bridge be "x" m

Distance = 333.3 + x m

Speed = 11.11 m/s

Time = 45 s

Distance = Speed * Time

333.3 + x = 11.11 * 45

333.3 + x = 495.5

             x  = 495.5 - 333.3

              x  = 166.65

Length of bride = 166.65 m

Hope it helps. Please mark it as the brainliest.