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Im having some trouble with this Accelerated Linear Motion question. I dont have any clue where i should even start with part (B).

(A) A particle moving in a straight line with constant acceleration passes three points, p, q and r and has speeds u and 7u and p and r respecitively.

(I) Find its speed at q, the midpoint of pr, in terms o u

(II)Show that the time from p to q is twice that from q to r

Im just lost, dont have a clue where to start. My head just starts to go into overload when i even think about it. Please help!(B) A juggler throws up six balls, one after the other at equal intervals of time t, each to a height of 3m. The first ball returns to his hand t seconds after the sixth was thrown up and is immediately thrown to the same height, and so on continually. You may assume that each ball moves vertically.

Find:

(i) the initial velocity of each ball

(ii) the time t

(iii) the heights of the other balls when any one reaches the jugglers hand.