Y=1/8x+c is the family of solutions of the differential equation y'=-8y^2, find the solution that satisfies the initial condition y(0)=3

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?

I'm confused on this could anyone me and show me what i need to do to solve it.

What is the volume of this container?