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Algebra
Tutor: None Selected Time limit: 1 Day

plane flying with the wind travels 375 mi. in 3 hours. on the return trip flying against the wind the same plane takes 5 hours to travel 375 mi. find the rate of the plane in still air & the rate of the wind 

define 2 variables

write 2 equations

solve 

Nov 9th, 2014

Let the speed of plane be x miles per hour

Let the wind's speed be y miles per hour

x+y = 375/3 =125 miles per hour (speed of plane with the wind)

x-y =375/5 =75 miles per hour (speed of plane against the wind

Adding 2x=200

x=100

y =125-100 =25

Answer : plane's speed =100 mile per hour

Wind's speed =25 mile sper hour

Nov 9th, 2014

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Nov 9th, 2014
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