Question 1185757
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If the question is to find each speed, then the problem can be reduced to this "time" equation


    {{{60/b}}} - {{{60/(b+15)}}} = 2 hours.



In the equation, "b" is the speed of the bicycle rider and (b+15) is the speed of the motorcycle driver,

in kilometers per hour.



This equation can be presented as a quadratic equation for unknown variable "b" by multiplying both sides 

of equation (1)  by b*(b+15).
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Just answered.