I have three algebra word problems that I have literally spent hours working on, and I feel extremely stupid because I cannot figure out how to set them up to get the correct answer! Any help would be greatly appreciated!
1. A radiator in a car - with a capacity of 3.7 liters - is filled with a solution of 60% antifreeze and 40% water. How much coolant should be drained and replaced with water to reduce the antifreeze concentration to 50%?
2. A pilot flew a jet from Montreal to Los Angeles, a distance of 2500 miles. On the return trip, the average speed was 20% faster than the outbound speed. The round-trip took 9 hours and 10 minutes. What was the speed from Montreal to Los Angeles?
3. A salesman drives from Ajax to Barrington, a distance of 120 miles, at a steady speed. He then increases his speed by 10 mph to drive the 150 miles from Barrington to Collins. If the second leg of his trip took 6 minutes more than the first leg, how fast was he driving between Ajax and Barrington?
Thanks in advance!