MATHEMATICS · Single correct · CBSE · Mathematics · Applications of Derivatives · Applications of Derivatives
Problem
Two boats depart from the same pier at noon. Boat A travels due east at a constant speed of 20 km/h, and Boat B travels due north at a constant speed of 15 km/h. How fast is the straight-line distance between the two boats changing at 2:00 p.m.?
(a) 17.9 km/h
(b) 25 km/h
(c) 35 km/h
(d) 5 km/h