Books with title Ten-Speed Summer

Jill's vacation gets off to a wild start when her best friend, Toni, thinks up a contest - who can be the first to date ten new boys! It seems like a great solution to a boring summer until the girls get into a big fight over one of the boys. Suddenly the friendly competition turns into all-out war. When Jill meets Date Number Three and she knows she's in love. And Craig likes her too - in fact, he wants her all to himself. But he doesn't know about the contest, and Jill's afraid to tell him. If she drops out of the contest, Jill won't be able to face her best friend. If she doesn't she'll lose the boy she loves.