The graph shows where four friends' houses are located. how many units is it between brian's house and sue's house? −11 units −9 units 9 units 11 units

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