<PRE><B>Question 965150</B>
Let the speed of the airplane be x mph
Let the speed of the wind be y mph
Speed=Distance/Time
When it is flying against the wind,
x-y=1800/3.6=500.........equation 1
When it flies with the wind,
x+y=1800/3=600..........equation 2
Adding equations 1 and 2 we get,
x+y+x-y=500+600
2x=1100
x=550 mph
y=50 mph
The speed of the plane is 550 mph.
Time taken to fly 3300 miles without the wind=Distance/Speed=3300/550=6 hours
Answer=6 hours</PRE>