The figure is not drawn to scale. Two balls, A and B, turn and move along the line CD in opposite directions. The radius of A is 80 m. The ratio of the diameter of Ball A to that of Ball B is 5 : 3. If Ball A turns 8 rounds and Ball B turns 3 rounds, how far apart are the centres of the balls? (Take π = 3.14)
Diameter of A
= 80 x 2 
= 160 m

Circumference of A
= 3.14 x 160
= 502.4 m

Diameter of B
= 160 x ⁵₃
= 266.66666666667 m

Circumference of B
= 3.14 x 266.66666666667
= 837.33333333334 m

Distance travelled by A
= 502.4 x 8
= 4019.2 m

Distance travelled by B
= 837.33333333334 x 3
= 2512 m

Total distance travelled
= 4019.2 + 2512
= 6531.2 m

Answer(s): 6531.2 m