A jet flew at an average speed of 480 mph from Point X to Point Y. the jet averaged only 460 mph on the return trip, and took 30 minutes longer.

Question

How many hours was the flight from Point Y to Point X?

Answer 1

d= rt

 

From X to Y

d₁ = 480t

 

From Y to X

d₂ = 460(t + .5)

 

Distances are the same , so

d₁ = d₂ or 480t = 460(t + .5)

 

Simplify and solve:

20t = 230 or t = 11.5 hours

 

On the return trip t = 11.5 + .5 = 12 hours