Answer:
dC = 72m < dA = 80m < dB = 90m
Step-by-step explanation:
In order to calculate the distance traveled by each mobile, you use the following formula:
(1)
d: distance traveled
v: speed of the car
t: time of the motion
You replace the values of v and t for each mobile:
mobile A:

mobile B:

mobile C:

Then, you obtain that he distances traveled by the mobiles show:
dC = 72m < dA = 80m < dB = 90m