SOLUTION: Sue can walk 1km/h faster than John. She completes 20km hike 1 hour before him. What are their walking speeds

Question 1071979: Sue can walk 1km/h faster than John. She completes 20km hike 1 hour before him. What are their walking speeds
Answer by ikleyn(52921) (Show Source): You can put this solution on YOUR website!
.

The governing equation is

 = 1,

where "s" is Sue rate, im mph.

(s-1) is John's rate.


You need to solve the equation for "s".


The first step is to multiply both sides of (*) by s*(s-1).
Then simplify and solve the quadratic equation.


Answer.  s = 5 mph (Sue), (s-1) = 4 mph (John).

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