SOLUTION: A plane on a search mission flew east from an airport, turned, and flew west back to the airport. the plance cruised at 300 km/h when byling east, and 400 km/h when flying west. th

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Question 398820: A plane on a search mission flew east from an airport, turned, and flew west back to the airport. the plance cruised at 300 km/h when byling east, and 400 km/h when flying west. the plane was in the air for 7 hours. how far from the airport did the plane travel?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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A plane on a search mission flew east from an airport, turned, and flew west back to the airport.
the plane cruised at 300 km/h when byling east, and 400 km/h when flying west.
the plane was in the air for 7 hours. how far from the airport did the plane travel?
:
let d = distance he flew from the airport
:
Write a time equation: Time = dist/speed
:
d%2F300 + d%2F400 = 7
Multiply by 1200 to get rid of the denominators
1200*d%2F300 + 1200*d%2F400 = 7(1200)
4d + 3d = 8400
7d = 8400
d = 8400%2F7
d = 1200 miles