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

An airplane flew 3 hours with a 30 mph head wind. The return trip with a tail wind of the same speed took 2 hours. Find the speed of the plane in still air.

d = 3(r − 30) and d = 2(r + 30)

d = 3(r + 30) and d = 2(r − 30)

d = 5(r + 30)

Question

Which set of equations would be used to solve this word problem?

An airplane flew 3 hours with a 30 mph head wind. The return trip with a tail wind of the same speed took 2 hours. Find the speed of the plane in still air.

 d = 3(r − 30) and d = 2(r + 30)

 d = 3(r + 30) and d = 2(r − 30)

 d = 5(r + 30)

anonymous · Answer

3 (r - 30) = 2 (r + 30)
r = 150