Assuming the above velocities do not change, how far will Rider A be from Rider B after 45 seconds?

Consider the following problem: a box with an open top is to be constructed from a square piece of cardboard, 3 ft wide, by cutting out a square from each of the four corners and bending up the sides. find the largest volume that such a box can have.

What object a collides with object b and bounces back its final momentum is?

If a simple machine reduces the strength of a force, what must be increased?