Practicing Success
A train of length 150 m takes 10 seconds to pass over another train 100 m long coming from the opposite direction. If the speed of the first train be 30 kmph, the speed of the second train is :
|
36 kmph 54 kmph 60 kmph 72 kmph |
60 kmph |
Speed = \(\frac{ Distance}{ Time}\) (30 + x) x \(\frac{5 }{ 18}\) = \(\frac{\text{150 + 100}}{ 10}\) 30 + x = \(\frac{\text{150 + 100}}{ 10}\) x \(\frac{18 }{ 5}\) 30 + x = \(\frac{\text{250}}{ 10}\) x \(\frac{18 }{ 5}\) 30 + x = \(\frac{\text{250}}{ 10}\) x \(\frac{18 }{ 5}\) 30 + x = 90 x = 60 km/hr |