1) Which of the following trains is the fastest ? A) 25 m/sec B) 1500 m/min C) 90 km/hr D) All the three speeds are equal Answer: Option DExplanation:25 m/sec $=\left(25\times \frac{18}{5}\right)$ km/hr = 90 km/hr And, 25 m/sec $=(25\times 60)$ m/min = 1500 m/min. So, all the three speeds are equal.
