Help with both questions I’ll mark brainliest

The dot diagram represents the motion of the motorcycle as it moves from left to right

Four friends, a, b, c, and d are standing varying distances away from a speaker which is producing sound waves.

Ablue car pulls away from a red stop-light just after it has turned green with a constant acceleration of 0.5 m/s 2 . a green car arrives at the position of the stop-light 6.5 s after the light had turned green. if t = 0 when the light turns green, at what time does the green car catch the blue car if the green car maintains the slowest constant speed necessary to catch up to the blue car? answer in units of s.