When larry drives the 12 miles he must travel to get to work, it usually takes him 30 minutes. on one day he traveled the first 6 miles at half his usual average speed. how fast must he drive for the next 6 miles in order for him to get to work at the usual time?

Afamily has two cars. the first car has a fuel efficiency of 25 miles per gallon of gas and the second has a fuel efficiency of 15 miles per gallon of gas. during one particular week, the two cars went a combined total of 1025 miles, for a total gas consumption of 55 gallons. how many gallons were consumed by each of the two cars that week?