Elizabeth is 11 meters into the race after 4 seconds but is only 13 meters in after 12 seconds (her tricycle is slow because she has a flat tire). what is her speed (in unit rate)

First total number of meters = 11 meters.

First number of seconds = 4 seconds.

Second total number of meters = 13 meters.

Second number of seconds = 12 seconds.

Speed in unit rate =

Plugging values in the formula.

Speed in unit rate =

=

On dividing 2 by 8 , we get 0.25.

Therefore, speed is 0.25 meter per second.