Students in a group dancing class are spaced evenly around a circle and they are counted off consecutively from the number 1. Student 20 is
directly opposite student 53. How many students are there in the group?

It took alice 5 5/6 hours to drive to her grandparents' house for . on the way home, she ran into traffic and it took her 7 3/8 hours. how much longer did the return trip take? write your answer as a proper fraction or mixed number in simplest form. the trip home took __hours longer. ?