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LarryJoeseph
05.07.2019 •
Mathematics
Alight private plane can fly 120 mph in still air. flying against the wind, the plane can fly 320 miles in the same time it requires to fly 640 miles with the wind. find the rate of the wind. a) 120 mph b) 80 mph c) 40 mph
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Ответ:
Alright, lets get started.
A light private plane can fly 120 mph in still air.
Suppose the speed of wind = x mph
Against the wind, speed of plane will be = 120-x
With the wind, speed of plane will be = 120+x
Flying against the wind, the plane can fly 320 miles, so time taken will be
t =![\frac{320}{120-x}](/tpl/images/0053/9743/ccfd5.png)
With the wind, the plane can fly 640 miles, so time taken will be
Both times are given same, so
Cross multiplying
Dividing from 320
x = 40 mph
So, the speed of the wind is 40 mph. : Answer
Hope it will help :)
Ответ:
1
Step-by-step explanation:
If the slopes are different, there is exactly one solution.
__
If the y-intercepts are the same, that solution is the y-intercept.