Problema Solution
an airplane travels 700 miles against the wind in 5 hours, and makes the same trip with the same wind in 2 hours. find the rate of the wind.
ellen wishes to mix candy worth $1.88 per pound with candy worth $3.09 per pound to form 30 pounds of a mixture worth $2.65 per pound. how many pounds of the more expensive candy should she use?
Answer provided by our tutors
1.)Let w = rate of the wind
and r = rate of plane in still air
5(w-r)=700
w-r= 140
and return trip
2(w+r)=700
w+r =350
add both,we get
2w=490
w=245
and r=105