SOLUTION: A man covers 31km in 4 hours. He cycled part of the way at 14 km/h and he walked the rest of the way at 4 km/h. How far did he walk?

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Question 449549: A man covers 31km in 4 hours. He cycled part of the way at 14 km/h and he walked the rest of the way at 4 km/h. How far did he walk?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
x+y=4
14x+4y=31
4x+4y=16
10x=15
x=1.5
y=2.5
2.5x4=10
The man walked 10 miles..