Solve the equation using inverse operations checker solutions in your final answer include all of your work 1/4 x^3 = - 27/4 please solve for X 

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