SOLUTION: I have been working on this math problem for awhile now and I can't figure it out. I was wondering if someone could help me? Please and Thank you!! I would deeply appreciate it.

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Question 154025This question is from textbook Algebra and Trigonometry Structure and Method book 2
: I have been working on this math problem for awhile now and I can't figure it out. I was wondering if someone could help me? Please and Thank you!! I would deeply appreciate it.
In a walkathon to raise money for a charity, Elisa walked a certain distance at 5 mi/h and then jogged that distance at 8 mi/h. Her total walking and jogging was 2 h and 15 min. How many miles long was the walkathon. (hint: time=distance over rate) This question is from textbook Algebra and Trigonometry Structure and Method book 2

Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
x/5+x/8=2.25
(8x+5x)/40=2.25
13x/40=2.25
13x=90
x=90/13
x=6.923 miles for walk & the jog distance.
proof:
6.923/5+6.923/8=2.25
1.38+.87=2.25
2.25=2.25