A water tank is filled with 1500L of water. In one hour, the tank loses 5.4 of water due to leakage. What is the volume of the water tank after an hour

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.