A 150 m long train crossed a person standing on a platform in 9 seconds. The speed of train in km/hr is
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 60
A person standing on the platform is taken as a point, so to pass him the train covers only its own length. Speed in m/s is turned into km/hr by multiplying by \(\frac{18}{5}\) (1 m/s = 3.6 km/hr).
Speed \(\displaystyle =\frac{150}{9}=\frac{50}{3}\) m/s
In km/hr: \(\displaystyle \frac{50}{3}\times\frac{18}{5}=60\)