When does two plus two equal five

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

Write as a product: ac^2–ad+c^3–cd–bc^2+bd

Express -5 2/5 as an improper fraction.