Which of the following trains is the fastest ?

A. 25 m/sec

B. 1500 m/min

C. 90 km/hr

D. All of these

Answer: Option D

Solution(By Examveda Team)

$$\eqalign{ & 25{\text{ m/}}\sec : \cr & = \left( {25 \times \frac{{18}}{5}} \right){\text{km/hr }} \cr & = 90{\text{ km/hr}} \cr & {\text{And, 25 m/}}\sec : \cr & = \left( {25 \times 60} \right){\text{ m/}}\sec \cr & = 1500{\text{ m/}}\sec \cr} $$
So, all the three speeds are equal.