Thats a question of relative velocity in one dimension and i desperately want a sol. for that?

a student is running at her top speed of 5m/s to catch a bus , which is stopped at the bus stop. when the student is still 40m from the bus, it starts to pnll away, moving with a constant acceleration of 0.170m/s2 .(a) for how much time and what distance does the student have to run at 5m/s before she overtakes the bus? (b) when she reaches the bus , how fast is the bus travelling?