X=WALKING SPEED

X+10=RIDING SPEED

Eqaution:



Cross multiply:

12(x)+8(x+10)=5[(x)(x+10)]







 

a=1, b=6, c=-16

 

Simplfy:

x=-8 or x=2

remove negative x=2

2+10=12

Hence, his walking speed was 2mph and his bike speed was 12 mph.

Paul. 

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