A jet travels 8280 miles in 9 hours flying against the jet stream. Flying with the same jet stream jet travels 9920 miles in 8 hours.

Question

What is the rate of the jet in still air?

what is the rate of the rate of the jet stream ?

Answer 1

distance = time times speed

8280 = 9(j-w)

8280 = 8(j+w)

9j- 9w = 8280

8j+8w = 9920

j-w = 8280/9 = 920

j+w = 9920/8 = 1915

2j = 920 + 1915 = 2835

j = 2835/2 = 1417.5 mph= jet speed in still air

w =1417.5-920 = 497.5 mph = wind speed