It takes Mr.Li 30 minutes to go to the library,and 40 minutes for Mr.Zhang.1.Calculate the ratio of time used by the two.2.Calculate the ratio of their walking speed
Little Lee arrives library to want for 30 minutes, the small piece wants for 40 minutes. 1.Beg the ratio of time that two people use. 2.Beg two people the ratio of the speed.
