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 :
Answer & explanation
Correct answer: option 3
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