Answer:
x=6/5 or 1.2
Step-by-step explanation:
2.5x=x+3
2.5x-x= 3
2.5x= 3
divide both by 2.5
x= 6/5 or 1.2
C.
The 520 is the new thing added to the equation, which makes it equal to the new weight room's size.
Distance between two skaters=40
difference in speed=2 m/sec
time=distance/time
=40/2
20 seconds