A train of length 540 m crosses a bridge of length 390 m in 30 seconds. What is the speed of the train (in km/h)?
Answer & explanation
Correct answer: option 3
Distance = Speed × Time
(540 + 390) = S × 30
⇒ S = \(\frac{930}{30}\) = 31 m/sec
To convert km/h into m/sec .
X m/sec × \(\frac{18}{5}\) = Y km/h
31 m/sec × \(\frac{18}{5}\) = 111.6 km/h