Two trucks leave a warehouse at the same time. one travels due north at an average speed of 62 miles per hour, and the other travels due south at an average speed of 61 miles per hour. after how many hours will the two trucks be 676.5 miles apart?

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