Rabbit runs in a straight line with a velocity of +1.4 m/s for a period of time, rests for 11 s, and then runs again along the same line at +0.64 m/s for an unknown amount of time. The rabbit travels a total distance of 1116 m, and its average speed is 0.72 m/s. (a) What is the total time the rabbit spends running at 1.4 m/s?