please explain step by step

Question 3. (15 pts) Blood flows from the heart (specifically, the left ventricle) into the aorta to feed the rest of the body oxygen. As blood flow moves from the ascending aorta and downward to the abdominal aorta, some of the volume is directed through a branching network. As the blood reaches the pelvic region, a bifurcation (see the figure below) occurs in the left and right common iliac arteries. This bifurcation is symmetrical, but the common iliac vessels are not the same diameter. Although the blood flow is a pulsatile flow, for the purpose of this problem we will assume the blood flow is steady, and work with the average velocities. Also, assume the arteries are rigid cylindrical pipes (this is also another simplification since the arteries are elastic and their diameters change in pulsatile flow). The diameters of the abdominal aorta, the right and left common iliac, and the mean pressures therein are given in the table below: (a) (5 pts) If the aorta's mean velocity is 30cm/s and the left common iliac artery's velocity is 40cm/s, determine the mean blood velocity in the right common iliac. (b) (10 pts) Determine the force needed to be supplied by the surrounding tissue due to the bifurcation if the angle between the left and right common iliac arteries is 75. (Neglect the effect of gravity)