A vehicle is moving with 20 m/s towards the east and another is moving with 15 m's towards the west if both vehicles begin to move simultaneously from the same place, what will be the distance between them after 2 minutes.(please write the step)

The space between two 15-in.-long concentric cylinders is filled with glycerin (viscosity = 8.5 × 10-3 lb·s/ft2). the inner cylinder has a radius of 1 in. and the gap width between cylinders is 0.1 in. determine (a) the torque and (b) the power required to rotate the inner cylinder at 180 rev/min. the outer cylinder is fixed. assume the velocity distribution in the gap to be linear.