1. With a tailwind, a jet flew 2000 miles in 8 hours, but the return trip against the same wind required 10 hours. Find the jets speed and the wind speed.
2.the coin box of the vending machine contains 6 times as many quarters as dimes. If the total amount of money at the end of the day is $28.80, how many of each kind of coin are in the box?
3. a 4% salt solution is mixed with a 16% salt solution. How many milliliters of each solution are needed to obtain 600 milliliters of a 10% solution?