An elevator can travel from the 10th level to the 16th level in 3 s. If the distance between one level and the next is 2.5 m, what is the speed of the elevator?

Assuming that there is a 13th floor, there are 6 levels.

Since each level is 2.5 m, there is a total distance of 6 x 2.5 = 15 meters.

Since it takes 3 seconds, its speed is 15 meters / 3 seconds = 5 m/s