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October 25, 2014

Posted by **jackie** on Sunday, December 7, 2008 at 1:08am.

- algebra -
**drwls**, Sunday, December 7, 2008 at 1:16amLet T1 (in hours) be the time of the first part of the walk and T2 be the time of the second part.

5 T1 + 3 T2 = 19 (km)

3 T1 + 5 T2 = 17 (km)

Solve those two equations for T1 and T2.

15 T1 + 9 T2 = 57

15 T1 + 25 T2 = 85

16 T2 = 28 etc. That tells you T1. Then solve for T2

T1 + T2 is the total time that it took.

- algebra (correction) -
**drwls**, Sunday, December 7, 2008 at 5:54amThe 16 T2 = 28 equation tells you that T2 = 1.75 hours

Therefore 5T1 + 5.25 = 19

T1 = 2.75 hours

Total time = 4.5 hours

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