Marksmen, Take 2

Two marksmen standing some distance apart and facing each other fire their rifles at the same time with the intent of both bullets hitting each other. The first marksmen has a relatively powerful rifle which fires at 2000 ft/sec while the second marksmen's rifle fires at 1500 ft/sec.
The first marksmen fires at a 45 degree angle relative to the horizon. What is the distance between the marksmen and what is the second marksmen's rifle angle. HINT: I believe the distance and second marksmen rife angel is unique for the two muzzle velocities. Also, ignore air friction. Kids, don't try this at home!

The Marksman

A marksman fires a rifle pointed horizontally (0 degrees vertical). The velocity of the bullet is 1000 ft/sec. Ignore air friction. The distance between the rifle and the ground is 3 feet. How far does the bullet travel before hitting the ground. (Hint: the marksman is on earth and not the moon).

Working Together

OK, here is another type of puzzle.
It takes Joe 4 hours complete a job. It takes John 6 hours to perform the same task while Bob can do it is 5 hours and Carl takes only 3 hours. How long will it take to complete the job is they all work together.

Bob, Jane, and Tom

OK, here is the last of this type of puzzle.
Bob is twice Jane's age
Jane is half Tom's age
Tom is 3 years older than Jane.
What are their ages?

Coffee, Beans and other Things.

Here is a new puzzle,
Joe buys 1 lb of coffee, 2 lbs of beans, and 1 lb of butter for a total of $6.99.
Paul buys 2 lbs of coffee, 1 lb of beans, and 1 lb of butter for $10.32.
Mark buys 2 lbs of coffer, 3 lbs of beans, and 1 lb of butter for $11.46.
What is the cost per lb of coffee, beans, and butter.
Hopefully this is a little harder that the 12 year old child.

New Puzzle!!

"In two years I will be twice as old as I was 5 years ago. How old am I?"
This should be relatively easy.

Equation using 1, 5, 6, and 7 which equals 21

OK, I finally remember a neat puzzle presented by a college professor while I was still working at Raytheon.

What is the equation which equals 21 and only uses the numbers 1, 5, 6, and 7?