请各位CD的学友帮忙解决一下问题

1)During a trip, Francine traveled x percent of the total distance at an average speed of 40 miles per
hour and the rest of the distance at an average speed of 60 miles per
hour.  In terms of x, what was Francine’s average speed for the entire trip?

2)A certain company that sells only cars and trucks reported
that revenues from car sales in 1997 were down 11 percent from 1996 and
revenues from truck sales in 1997 were up 7 percent from 1996.  If total revenues from car sales and truck
sales in 1997 were up 1 percent from 1996, what is the ratio of revenue from
car sales in 1996 to revenue from truck sales in 1996 ?

3)Each week, Harry is paid x
dollars per hour for the first 30 hours and 1.5x dollars for each additional hour worked that week.  Each week, James is paid x dollars per hour for the first 40 hours and 2x dollars for each additional hour worked that week.  Last week James worked a total of 41
hours.  If Harry and James were paid the
same amount last week, how many hours did Harry work last week?