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anonymous
 5 years ago
help! how do figure this out A plane can fly 300 miles in the same time as it takes a cr to go 120 miles. If the car travels90 mph slower than the plane, find the speed of the plane
anonymous
 5 years ago
help! how do figure this out A plane can fly 300 miles in the same time as it takes a cr to go 120 miles. If the car travels90 mph slower than the plane, find the speed of the plane

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0ah ok. so you have some pieces of information that you need to turn into an equation you can solve

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0so we have two basic variables, the speed of the plane, and the speed of the car

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0since the plane goes 320 miles in the same time the car goes 120 miles, the plane's speed (p) in relation to the car's speed is 320/120

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0that is: 1. p = 320/120 c

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0the second piece of information is that the car travels 90 mph slower than the plane

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0now that you have two equations, and two variables, you can solve via subsitution

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0so for our case, let's take the value of (c) from the second equation, and substitute it for the (c) in the first equation

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.01. p = 320/120 c , if c = p  90, is the same as: 2. p = (320 x (p  90))/120 3. p = 8(p  90)/3 (reducing the fraction part) 4. p = 8p  720/3 5. 3p = 8p  720 6. 5p = 720 7. p = 144

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0so the plane travels 144mph
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