1 answer

A plane flies the first half of a 5600 km flight into the wind in 3.5 hours

Question:

A plane flies the first half of a 5600 km flight into the wind in 3.5 hours. The return trip, with the same wind, takes 2.5 hours. Find the speed of the wind and the speed of the plane in still air.

Answers

S = plane's speed
w = wind speed

2800/(s-w) = 3.5
2800/(s+w) = 2.5

3.5s - 3.5w = 2800
2.5s + 2.5w = 2800

s = 960
w = 160

2800/800 = 3.5
2800/1120 = 2.5.

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