David has $17000 to invest. he invests $12000 in a mutual fund that pays 12% annual simple interest. if he wants to make at least $2200 in a yearly interest, at what minimum rate does the remainder of the money need to be invested

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