Paula and nikita are moving in the xy-plane. they both along straight lines at constant speeds, and they both start at the same time. paula starts from the point (0,3) and heads directly toward the point (-5,-2), reaching that point in 5 seconds. nikita starts from the point (4,0) and heads directly toward the point (-10,0), reaching it in 2 seconds. let t be the time since they started moving. find the value of t when nikita and paula are a distance 5 units apart.