A teenager's heart pumps an average of 7200 L of blood every 24 hours. what is the rate of change of volume of blood? That is per 1 hour

Answer 1

7200/24 = x/1
7200/24 = 300/1
300 L of blood per hour.

Answer 2

particle B of mass 1.5 kg is attach to a spring of stiffness 3 Nm-1. The other end of the spring is fixed at a point A and the spring hangs vertically. A second spring, also of stiffness 3 Nm-1, is attached to particle B at one end and to a second particle C, of mass 1 kg at the other end, also hangs vertically as shown in Figure Q2. Let x and y be the displacements of the particles B and C respectively from their equilibrium positions.