SOLUTION: a plane flies 435 miles with the wind and 345 miles against the wind in the same length of time . If the speed of the wind is 15mph , find the speed of the plane in still air
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Question 362366: a plane flies 435 miles with the wind and 345 miles against the wind in the same length of time . If the speed of the wind is 15mph , find the speed of the plane in still air Answer by mananth(16946) (Show Source):
You can put this solution on YOUR website! a plane flies 435 miles with the wind and 345 miles against the wind in the same length of time . If the speed of the wind is 15mph , find the speed of the plane in still air
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plane speed in still air = x mph
with wind speed = x+15
against wind speed = x-15.
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time = distance /speed
with wind time = 435/x+15
against wind time = 345/x-15
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times are same
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435(x-15)=345(x+15)
435x-6525=345x+5175
435x-345x=6525+5175
90x=11700
x= 11700/90
x= 130 mph speed of plane in still air
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m.ananth@hotmail.ca
