SOLUTION: A plane can fly 420 miles in the same time as it takes a car to go 120 miles. If the car travels 100 mph slower than the plane, find the speed of the plane.
so what is the speed
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so what is the speed
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Question 302987: A plane can fly 420 miles in the same time as it takes a car to go 120 miles. If the car travels 100 mph slower than the plane, find the speed of the plane.
so what is the speed of the plane ?
thank you :) Answer by mananth(16949) (Show Source):
You can put this solution on YOUR website! A plane can fly 420 miles in the same time as it takes a car to go 120 miles. If the car travels 100 mph slower than the plane, find the speed of the plane.
so what is the speed of the plane ?
thank you :)
Letthe rate of the plane be x
distance traveled by plane = 420 miles
time taken by plane = 420/x
distance traveled by car =120 miles
rate of car = x-120
time taken by car = 120 / x-100
the time taken by both are same
420/x = 120/ x-100
420(x-100)=120x
420x-42000 = 120x
420x-120x=42000
300x= 42000
x=42000/300
x=140 mph the speed of the plane
