Question

Which set of equations would be used to solve this word problem?

An airplane flew 5 hours with a 50 mph head wind. The return trip with a tail wind of the same speed took 3 hours. Find the speed of the plane in still air.

d = 8(r + 50)

d = 5(r + 50) and d = 3(r − 50)

d = 5(r − 50) and d = 3(r + 50)

None of these systems can be used to solve this problem.

Answer 1

d = 5(r − 50) and d = 3(r + 50)
5 hours = rate -50mph winds
thats answer..

Answer 2

d=5(r-50)
d=3(r+50)
d=d
5r-250=3r+150
2r=400
r=200 mph
d=750 miles