<PRE><B>Question 1186288</B>
speed with the wind is 200+w
speed against the wind is 200-w
takes 500/(200+w) hours with the wind
takes 300/(200-w) hours against the wind
those are equal 
cross multiply,
100000-500w=60000+300w
40000=800w

w=50 mph
250 mph with wind = 2 hours for 500 mi.
150 mph against wind = 2 hours for 300 mi.</PRE>