Diggy and Lenny are bike racers and very close friends. During practice, Lenny gives Diggy a 20 meter head start. After t seconds, Diggy is at 4t + 20 m distance from the starting point and Lenny is at St m distance from the starting line. Let d(t) = distance.
1. How far ahead of Lenny is Diggy after t seconds?
2. How far are they in:
a. t= 15
b. t = 25
c. t= 35
3. Does Lenny ever catch up with Diggy? If so, after how many seconds?​