Kemen leaves home at 09:00 and drives at a speed of 20 km/h. After hour he increases his speed to 45 km/h and continues at this speed until 10:45.
He stops from 10:45 until 11:30 and then returns home at a speed of 50 km.

“exterior angles of triangles. an exterior (or external) angle is the angle between one side of a triangle and the extension of an adjacent side. try this drag the orange dots on any vertex to reshape the triangle.” look to get to the answer i explained what it means and other things i hope it you .