Solve the problem.
-From a point on a river, two boats are driven in opposite directions, one at 9 miles per hour and the other at 11 miles per hour. In how many hours will they be 40 miles apart?
A) 3 hr
B) 2 hr
C) 1 hr
D) 4 hr

Question

Quizplus · Accepted Answer

The relative speed of the two boats is 9 + 11 = 20 miles per hour. To be 40 miles apart, it will take 40 / 20 = 2 hours.

Solve the Problem. -From a Point on a River, Two Boats Are Driven