SOLUTION: An airplane whose speed though the air is 500 km/hr covers a distance over the ground of 1,000 km in 2.5 hours. How fast was the wind against the plane?

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Question 97430This question is from textbook The Physical Universe
: An airplane whose speed though the air is 500 km/hr covers a distance over the ground of 1,000 km in 2.5 hours. How fast was the wind against the plane? This question is from textbook The Physical Universe

Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
1000/(500-x)=2.5 cross multiply
2.5(500-x)=1000
1250-2.5x=1000
-2.5x=1000-1250
-2.5x=-250
x=250/-2.5
x=100 kph. is the speed of the wind.
proof
1000/(500-100)=2.5
1000/400=2.5
2.5=2.5