One plane can travel 30 miles per hour faster than another. One of them goes 285 miles in the same time it takes the other to go 240 miles. What are their speeds?
A) 160 mph; 190 mph
B) 140 mph; 170 mph
C) 170 mph; 200 mph
D) 130 mph; 160 mph
E) 180 mph; 210 mph

Question

Quizplus · Accepted Answer

Let x be the speed of the slower plane. Then the speed of the faster plane is x + 30.We know that the slower plane travels 240 miles in the same time it takes the faster plane to travel 285 miles. So we can set up the following equation:240 / x = 285 / (x + 30)Solving for x, we get:x = 140So the speed of the slower plane is 140 mph, and the speed of the faster plane is 140 + 30 = 170 mph.

One Plane Can Travel 30 Miles Per Hour Faster Than