4. (5 points)
A boat requires four hours to travel a given distance upstream against a five mile per hour current, but only requires three hours to travel downstream with that same current back to the dock. Find the speed of the boat in still water.

5. (5 points)
A gas station owner has 30 gallons of gasoline for which he charges $3.03 per gallon and
some for which he charges $3.74 per gallon. How many gallons of the $3.74 brand must the owner mix in to produce gasoline that costs $3.28 per gallon?

6. (5 points)
Ms. Blackmon invested $8000, part at 4% and the rest at 5% per year. How

Question

4. (5 points) 
A boat requires four hours to travel a given distance upstream against a five mile per hour current, but only requires three hours to travel downstream with that same current back to the dock.  Find the speed of the boat in still water.

5. (5 points) 
A gas station owner has 30 gallons of gasoline for which he charges $3.03 per gallon and
some for which he charges $3.74 per gallon. How many gallons of the $3.74 brand must the owner mix in to produce gasoline that costs $3.28 per gallon?

6. (5 points) 
Ms. Blackmon invested $8000, part at 4% and the rest at 5% per year. How

anonymous · Answer

6. (5 points) 
Ms. Blackmon invested $8000, part at 4% and the rest at 5% per year. How much did she invest at each rate if her total return per year on the investments was $380?

7. (5 points) 
A bus entered the Interstate and traveled at a constant speed of 42 mph. Two hours later a second bus followed the first bus, entering the Interstate from the same point as the first bus, and traveled at a constant speed of 66 mph. How long will it take the second bus to catch up with the first bus?

8. (5 points) 
Joe has a collection of nickels and quarters that is worth $7.40. If the number of nickels were doubled and the number of quarters were increased by 8, the value of the coins would be $10.80. How many quarters does he have?