A train that is running at the speed of 78 km/h crosses an electric pole in 9 seconds.  The length of train (in meters) is?

195

Distance = Speed × Time

To convert km/h into m/sec . 

 X km/h  ×  \(\frac{5}{18}\) = y m/sec 

 78 km/h  ×  \(\frac{5}{18}\) =   78 ×  \(\frac{5}{18}\) m/sec 

Distance = = 78 × \(\frac{5}{18}\) × 9 = 195 meter