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12. An avalanche rescue team travels 8.55 km along a snow-covered trail. For the first section, the trail is flat. The team averages a speed of 2.7 km/h. Then, the terrain becomes mountainous and their average speed is only 1.2 km/h. The one-way trip takes the team 4.0 h. Determine the distance that the team travels on each type of terrain.

1 answer

add up the times, knowing that time = distance/speed:

x/2.7 + (8.55-x)/1.2 = 4.0
x = 6.75

so,
6.75km flat
1.80km mtns
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