This ain’t mine but here is someone else’s
Answer:
Part a)


Part b)

Explanation:
Part a)
Constant speed by which the student will run is given as

now after some time if student is going to overtake the position of bus
so here the final positions will be same
so we have




so it is

So student will run the total distance



Part b)
Speed of bus when student reach the bus is given as



Can i have more information?
Most objects move at a constant speed because of friction and acceleration. The constant speed keeps them in place, and keeps a balance.