math
posted by shane on .
divide $ 680.00 among three children with the ratio 2:4:6 please show me how to work out the answer

Imagine you're dividing the money into equal piles, and you're giving
2 piles to the first
4 piles to the second
6 piles to the third
How many piles do you need?
How much money is in each pile?
Now, how much money does each get? 
Two planes started at the same time from two airports that are 3600 kilometers apart and flew toward each other. One plane flew at 792 kilometers and the other flew at 888 kilometers per hour. In how many hours were the planes still 240 kilometers part?