In how much time will a 100 m long train cross an electric pole if its speed is 144 Km/hr?
Answer & explanation
Correct answer: option 2
Speed = 144 x \(\frac{5 }{18 }\) m/sec
Speed = \(\frac{Distance }{Time }\)
144 x \(\frac{5 }{18 }\) = \(\frac{100 }{Time }\)
40 = \(\frac{100 }{Time }\)
Time = \(\frac{100 }{40 }\)
Time = 2.5 sec