Five friends are going to share 1/2 of a pizza. How much of a whole pizza will each friend eat?

Which equation can be used to solve the problem above?
5 divided by 1/2 = n
1/2 divided by 5 = n
n divided by 5 = 1/2
n divided by 1/2 = 5

Cody started biking to the park traveling 15 mph, after some time the bike got a flat so cody walked the rest of the way, traveling 4 mph. if the total trip to the park took 6 hours and it was 46 miles away, how long did cody travel at each speed? solve using rate times time= distance