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July 28, 2014

July 28, 2014

Posted by **Ellen P** on Thursday, October 11, 2012 at 9:39pm.

- Algebra -
**Reiny**, Thursday, October 11, 2012 at 9:57pmlength of trail ---- x km

time to go uphill = x/2.2

time to go downhill = x/3.3

x/2.2 + x/3.3 = 12

times 6.6

3x + 2x = 79.2

5x = 79.x = 15.84 km

the trail was 15.84 km long

check:

time uphill = 15.84/2.2 = 7.2 hrs

time downhill = 15.84/3.3 = 4.8 hrs

7.2 hrs + 4.8 hrs = 12 hrs

All is good!

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