<PRE><B>Question 957352</B>
A plane has a cruising speed of 200  miles per hour when there is no wind. At this speed, the plane flew 500miles with the wind in the same amount of time it flew 300
miles against the wind. Find the speed of the wind.
***
let c=speed of wind
200+c=speed of plane with the wind     
200-c=speed of plane against the wind 
travel time=distance/speed (same for both directions)
..
{{{500/(200+c)=300/(200-c)}}}
500(200-c)=300(200+c)
100000-500c=60000+300c
800c=40000
c=50
speed of wind=50 mph</PRE>