Answer:
Draw a line going down from the 300, with a break in the middle and finish it out at the 6 hr mark.
Explanation:
Start at the 300 and draw that line down to the 180 mark lined up with the 2 hour dot. Then draw a horizontal line from there to the middle of the 2 and the 4. Then draw a line from where you ended the break with the same slope as the beginning.
Hope this helps!