SOLUTION: Α Boy covered 31 km in 4 hours He cycled part of the way at 14km/h and walked the rest of the way at 4km/h How far did he walk?

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Question 870282: Α Boy covered 31 km in 4 hours
He cycled part of the way at 14km/h and walked the rest of the way at 4km/h
How far did he walk?

Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
Boy covered 31 km in 4 hours
He cycled part of the way at 14km/h and walked the rest of the way at 4km/h
How far did he walk?
let him walk x km
speed =4 km/h
t=x/4
he will cycle 31-x
speed =14km/h
t=(31-x)/14
cycle time + walking time = 4
x/4 + (31-x)/14 =4
Multiply by LCM 28
7x+2(31-x)=4*28
7x+62-2x=112
5x=112-62
5x=50
x=10 km
he walks 10 km