How to solve Physics Paper 1 questions???

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I am really stuck on how to solve these questions and I don't understand why the mark scheme says that the answers for question 8, 12 and 14 are A, A and D, respectively. I would greatly appreciate any help/suggestions/tips!! These questions are from the Paper 1 in May 2018 Timezone 2.

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14. Let t be the time for the slower wave takes to reach detector; the faster wave takes t - 15

5(t) = 7.5(t - 15) (distance traveled by both waves is the same).

t = 45

5 km/s * 45 s = 225 km

12. Temperature and internal energy are related to average kinetic energy of the molecules (that is, kinetic energy with respect to center of mass). Since only the center of mass is moving, and we are not shaking the container, there is no change in temperature and no change in internal energy.

8. The net force of system  = total mass of system * net acceleration

Net force is the weight, W. Total mass is M and the mass of the weight, or W/g, and net acceleration is a.

W = (M + W / g) * a

W (1 - a/g) = Ma

W = Ma / (g/g - a/g)

W = Mag / (g - a)

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