SOLUTION: A runner 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 449567: A runner 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 rwm(914) About Me  (Show Source):
You can put this solution on YOUR website!
r*t+r*t=d
14*c+4*w=31
c+w=4
c=3/2=1.5 hrs cycling
14*3/2=7*3=21 km cycling
w=5/2=2.5 hrs walking
4*5/2=10 km walking