What is the ratio between the distance travelled by the oscillator in one time period and amplitude?

Hint: The oscillating particle covers a distance equal to amplitude in one-fourth of the oscillation.
Step 1: Find the distance covered by the particle in one oscillation.
The diagram represents the motion of a particle executing SHM between A and B.
                
The total distance travelled while it goes from A to B and returns to A = AO+OB+BO+OA
 =A+A+A+A=4A                             [OA=A]
Amplitude =OA=A
Step 2: Find the ratio.
Hence, the ratio of distance and amplitude =4AA=4