Question 398820
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/300}}} + {{{d/400}}} = 7
Multiply by 1200 to get rid of the denominators
1200*{{{d/300}}} + 1200*{{{d/400}}} = 7(1200)
4d + 3d = 8400
7d = 8400
d = {{{8400/7}}}
d = 1200 miles