A car is driving due west away from an intersection at 60 km/h
MATHEMATICS · Single correct · AP · Calculus AB · Contextual Applications of Differentiation · Contextual Applications of Differentiation
Problem
A car is driving due west away from an intersection at 60 km/h. At the same time, a cyclist is 3 km south of the intersection and riding due north toward it at 20 km/h. When the car is 5 km west of the intersection and the cyclist is 1 km south of it, approximately how fast is the distance between the car and the cyclist changing?
(a) about 63 km/h
(b) about 42 km/h
(c) about 55 km/h
(d) about 56 km/h