Distance, rate, time equation

Question

A jet travels 2996 miles against a jetstream in 4 hours and 3476 miles with the jetstream in the same amount of time. What is the rate of the jet in still air and what is the rate of the jetstream?

Answer 1

Rate of jet against jet stream: 2996 miles / 4 hours = 749 mph

Rate of jet with jet stream: 3476 miles / 4 hours = 869 mph

Rate of jet in still air = average of against and width = (749 mph + 869 mph) / 2 = 809 mph

Rate of jet stream = 809 mph - 749 mph = 60 mph

Answer 2

2995 4hrs against

+3476 4hrs with

=6471/2=3235.1mph