Velocity Before And After Pictures Velocity - Time Graph - Ive Uploaded The Pic On A Link To Make It Easier?

Velocity - time graph - Ive uploaded the pic on a link to make it easier? - velocity before and after pictures

A car accelerates uniformly at 10 s rest at a speed of 15m / s. For 25 seconds before slowing down uniformly kept at rest after a further 15 s. Speed Search:
a) the total distance traveled by the vehicle
b) the distance he has traveled, when it slowly began to
c) come the time required for half of the course

Heres a picture of the graph, so that they do not take
http://www.flickr.com/photos/36139954 @ N08/3855685788 /