Factor the expression using GCF

7b-7

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

Ihonestly have no clue if it's each or none.

Arational number that is equivalent to -20/4?