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Her average rate traveling uphill was 1.8 kilometers per hour and her average rate down hill was 4.2 kilometers per hour. If she spent a total of 16 hours hiking, how long was the trail?

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add up the times to hike d km:

d/1.8 + d/4.2 = 16
0.5555d + .2381d = 16
d = 16/.7936 = 20.16 km

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