Jacob ate1/2 of strawberry tart in morning. In evening he ate 1/4 more of the same tart. How do you find the answer ​

Johnny rode his bike to a friends house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was unable to play. what was his displacement for the total bike ride trip? what could you use as a reference point ? show the steps to solve this problem.