Erik can u help me daddy?

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

With alll of except for the 2 that i did already

Factor the polynomial expression x6 – x3 – 20