Simple Kinematics Question

Hi guys, having some trouble with this question as I cannot see where I am going wrong. Very simple question but I must be misunderstanding something.
1. The problem statement, all variables and given/known data
The following table shows how the velocity of a car varied with time:

Velocity (km/h) 0 19 35 48 48 27 0
Time (s) 0 3 6 9 12 15 18

Assuming these speed values to be joined by straight lines, plot a graph of speed against time and determine the total distance travelled.

2. Relevant equations
s = dxt
Area under graph = distance travelled

3. The attempt at a solution
I assumed this question would be as simple as finding the area under the graph to get the total distance travelled. So I went about drawing my graph along with converting all the values for speeds into (m/s). I have attached a picture of what my graph looks like in case anyone would like to see it (its a bit messy). I’m sure there is a very simple explanation to where I am going wrong but I’m just not seeing it myself.

Thanks in advanced guys!

Attached Images
File Type: jpg photo.JPG (83.2 KB)

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