From a point on a river, two boats are driven in opposite directions, one at 10 miles per hour and the other at 11 miles per hour. In how many hours will they be 63 miles apart?
A) 5 hours
B) 4 hours
C) 3 hours
D) 1 hour

Question

Quizplus · Accepted Answer

Since the boats are moving in opposite directions, their speeds add up. Therefore, their combined speed is 10 + 11 = 21 miles per hour. To find the time it takes for them to be 63 miles apart, divide the distance by their combined speed: 63 / 21 = 3 hours.

From a Point on a River, Two Boats Are Driven