Question

The diagram shows the (t,v) graph for a miniature train as it moves along a straight tracks. At time=0 the train passes a point A and is moving is 3ms^-1. The furthest point from A reached by the train in the 2 minutes period is P. find
a) The value of t at the instant that the train reaches P
b) The magnitude of the acceleration of the train in the time intervals 50< or equal to t< or equal to 80
c) The distance of the train from A at the end of the 2 minutes period.