Question 156726
A small plane flying into the wind takes 3h20mins to complete a flight of 960km. Flying with the wind, the same plane takes 2h30mins to make the trip. What is the speed of the plane? What is the speed of the wind? 
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Let p = speed of plane
and w = speed of wind
.
Then, from the distance formula:
d = rt
where
d is distance
r is rate or speed
t is time
.
Start by converting the times given to hours (60 mins per hour):
3h20mins = 3+20/60 = 3.333 hours
2h30mins = 2+30/60 = 2.5 hours
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against wind:
960= (p-w)3.333
960= (p+w)2.5
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Can you complete it from here?