The position time graph of an ant travelling on a floor is shown in the figure. The x-axis shows time in seconds(denoted by t) and the corresponding positions(denoted by y) can be read on the y axis. For 0<=t<=4. The shape of the path is parabolic and then onwards the shape is a straight line.

a) If instead of moving on the straight line, the ant had continued to move on the same parabolic path beyond t=4 as well, what would be her position at t=6?

b)The ant moves at a constant speed of sq.rt of 13 units per second for time t>=4. How long does it take to transverse the straight line path?