SOLUTION: A bicyclist is traveling twice as fast as someone walking. If their combined speed is 21 miles per hour, find the speed of the person walking.

Algebra ->  Equations -> SOLUTION: A bicyclist is traveling twice as fast as someone walking. If their combined speed is 21 miles per hour, find the speed of the person walking.      Log On


   

Question 365120: A bicyclist is traveling twice as fast as someone walking. If their combined speed is 21 miles per hour, find the speed of the person walking.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi, 

Let x represent the speed of person walking, then 2x would be the speed of the bicyclist

question states

x + 2x = 21mph

solve for x

3x = 21mph

x = 7mph,  the speed of the person walking