Which of the following must be true if Rohan takes longer than John to finish a running race?

• The object's speed determines its fast and slow motion.
• It is given as the distance covered per unit of time. 
  Speed= $\frac{\mathrm{Distance}}{\mathrm{Time}}$
• When an object is in slow motion, it takes more time to cover a distance whereas when the object is fast, it takes less time to cover the same distance.

Therefore, since Rohan takes more time to finish the race, we can conclude that he runs more slowly than John.