The number of minutes that will take them to do one loop in a track of 20 m long is approximately 4 minutes
The speed of the toy engine around the Christmas tree is 300 meters/hour.
The number of minute for them to do one loop if the track are 20m long is as follows:
1 loop = 20m distance
Therefore,
300 = 20 / t
t = 20 / 300
t = 1 / 15 hours
t = 3.9999999996
t ≈ 4 minutes
learn more on time here: https://brainly.com/question/17199920?referrer=searchResults