Christina used 2 1/3 gallons of gas to drive her car 64 1/6 miles. What was the fuel efficiency of her car, in moles per gallon, for the trip

Can someone answer this question? : )

If the scale factor between two circles is 2x/5y what is the ratio of their areas?

Acyclist bike x distance at 10 miles per hour .and returns over the same path at 8 miles per hour. what is the cyclist average rate for the round trip in miles per hour ?