Distance is how much you traveled from begin to end so if you traveled along a road that was 500 m twice then your distance is 1000 m
displacement is change in position between your starting and ending points and since you started and ended at the same place then your displacement is 0<span />
I would write them all out but im lazy. change the noun after the word by and make that the subject of the sentence followed by the verb and the rest of the sentence :)