What is the slope of this line?

I’m stuck on this i don’t understand.

If 1 km = 0.621 miles, how many miles are in a centimeter

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. ?