A motorcyclist travels from A to B along a straight road, as shown in Fig. 1.1
The motorcyclist passes over the minor crossroads at A at 15 m / s and, for most of the distance between A and B, he continues at 15 m / s
The road is flooded at one point, so he has to slow down to ride through the water. He also slows down and stops at the major crossroads at B