The graph shows the velocity of a train.
a) Use four strips of equal width to estimate the distance the train travelled in the
first 20 seconds.
![The graph shows the velocity of a train a Use four strips of equal width to estimate the distance the train travelled in the first 20 seconds class=](https://us-static.z-dn.net/files/d82/13084c2aefa4f20a2dfc897129134447.png)