Two cars are approaching an intersection. One is 1 mile south of the intersection and is moving at a constant speed of 40 miles per hour. At the same time, the other car is 2 miles east of the intersectionand is moving at a constant speed of 10 miles per hour.
(a) Express the distance d between the cars as a function of timet. (Hint: At t=0, the cars are 1 mile south and 2 miles east of the intersection, respectively.)
d =