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q2 part ii) he ran 20 m from 20-24. and he ran 20*7 from 0-10 seconds. so add them to get the distanc he moved in forward direction.
Q4 part i)
why we can't use the formula? acceleration is constant so why not?

We get wrong answer for u = 8 :/

i don't get it. what are you saying?

q4 part i) We can use that V^2 - U^2 = 2as, right ?
We dont get correct answer when u take initial velocity as 8 :/

you are talking about displacement of B when A has reached maximum height?
you can't use that formula without finding final velocity of B at the point when A is maximum. initial velocity is 8 but final velocity is not zero for B.