lucy is a student and she is 13.today is her birthday.

lucy is a student and she is 13.today is her birthday.
this morning her parents give her a nice present----a new bike.lucy is very happy.after breakfast,she goes to school on the bike.her classmates all say,''what a nice bike!''lucy smiles,''thank you.the bike can save me half the time.''one of her friends says,''that is good.happy birthday,lucy.but when you have two bikes one day,they can save you the whole time on the way,is that right?''
can two bikes save her the whole time on the way?try to write some sentences to talk about it.