1.8 determine the distance travelled from the area between a velocity-time graph and the time axis

Distance can be calculated by finding the area between the velocity time graph (line) and the time axis. If you look there is a shape formed between the two lines, find the area of this using the measure given on the sides
e.gThe width of the triangle is 4 seconds and the height is 8 metres per second. to find the area  of a triangle is 1/2 x base x height so 1/2 x 8 x 4= 16
The width of the rectangle is 6 seconds and the height is 8 metres per second. So the area is 8 × 6 = 48 m. Making the overall area 16 + 48 = 64 m.
(BBC bitesize)