A 30 gram ball rolls along a flat surface at a constant speed in the same direction over 4 meters in 20 seconds. Which is the speed of the
 ball? (speed = distance = time)
 A. 0.2 meters per second
 OB. 0.5 meters per second
 c. 20 meters per second
 D. 80 meters per second
 Please answer this FAST!