Help please i don’t know

(98 points) i need with 5 questions. answer definitions are welcomed, but not necessary.

How do you find the area of a triangle

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