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 10 miles per hour. In how many hours will they be 57 miles apart?
A) 4 hr
B) 1 hr
C) 5 hr
D) 3 hr

Question

Quizplus · Accepted Answer

The relative speed of the two boats is 9 + 10 = 19 miles per hour. To find the time it takes for them to be 57 miles apart, divide the distance by the relative speed: 57 miles ÷ 19 miles per hour = 3 hours.

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