A train 120 m long passes a telegraph post in 6 seconds. Find the speed of the train in Km/hr
Answer & explanation
Correct answer: option 2
Speed = \(\frac{Distance }{Time }\)
Speed = \(\frac{120 }{6 }\) m/s
Speed = 20 m/s
Speed in km/hr: 20 x \(\frac{ 18}{5 }\) = 72 km/hr
*Note*:
To convert m/s to km/hr we multiply by \(\frac{ 18}{5 }\)
To convert km/hr to m/s we multiply by \(\frac{5}{18}\)