Question 963404
we will find the time it takes him to ride 50 or drive 125 given that he drives 30mph faster than he can pedal.
------------------------
We have to begin with the formula
d= r*t (distance = rate * time)Therefore:
r= d/t 
------------------------
And the problem says that 
d/t(b)= d/t(d)-30
50/t = (125/t)-30 Subtract 125/t, both sides:
-75t= -30 Divide both sides by -75 (remember -/- = +)
t= 2.5 This is the time it takes him to bike 50 or drive 125
50/2.5= 20 this is how fast he goes on his bike
125/2.5= 50 is how fast he drives
-------------------------
Proof: 50(drive)-30= 20(bike) we have the correct answers.