Please attach the solutions to this questions. Thank you in advance

8. A particle P moves on the x-axis. At time t seconds the velocity of P is vm s in the direction of x increasing, where v is given by 3 Osts 4, D = 8t -5 1 2 , 16 - 2t, t> 4 When t = 0, P is at the origin O. Find a) the greatest speed of P in the interval 0 4, d) the total distance travelled by P in the first 10 s of its motion