Red and Orange want to meet in the electrical room. They are 30 ft apart. Red moves at 4 ft per second while Orange moves 6 ft per second. How many seconds will it take them to meet?

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.