I am so confused!!! Please help with these two.

The curren in a stream moves at a speed of 4 mph. A boat travels 5 mi upstream and 13 mi downstream in total time of 2 hr. What is the speed of the boat in still wanter??

here is the second one. I don't even know where to start on this one.

A tablecloth measures 96in by 72in. It is laid on a tabletop with an area of 5040in^{2}, and hangs over the edge by the same amount on all sides. By how many inches does the cloth hang over the edge??

Please help!!!

## Comments

Simplify,

u2 - 9u = 0

This is where I was messing up? How did you get that?

Use the units. miles/mph = hours

hours going upstream + hours going downstream = 2

5(u+4) + 13(u-4) = 2(u

^{2}- 16)5u+20+13u-52 = 2u

^{2}- 32Add 32 to both sides,

18u = 2u

^{2}/2, 9u = u

^{2}u

^{2}- 9u = 0