Question

Then, the dot ran from −81 to 81. What distance did it cover? If the average speed of the dot during this run was 18 units per minute, how long did this run take?

Answer 1

Distance = 162 units

Time 9 minutes

Explanation:

The distance from -81 to 0 is 81 units

The distance from 0 to 81 is 81 units

The total distance is 81+81 = 162 units

OR

81-(-81) = 162

Distance = 162 units

Distance = rate * time

We know the distance and the rate = 18 units per minute

162 = 18* time

Divide each side by 18

162/18 = 18/18 * time

9 = time

The time is 9 minutes