Two persons moving on an annular road

There is an annular road as shown in the figure passing along P point and Q point.

The distance between P and Q is the same in a clockwise rotation or a counterclockwise rotation.

Taro moves from P clockwise and Jiro moves from Q counterclockwise on the road.

They leave simultaneously and continue moving by a fixed speed respectively.

5 minutes after leaving, Taro and Jiro met for the first time at R point since they left.

Taro moved 4 km after the 1st meeting and met with Jiro again at S point.

The distance of S point and Q point is 1.2 km along the road.

Answer each of following questions.

(1) Find the speed of Taro an hour.

(2) Find the distance of the shorter one along the road from P point of R point.

(3) Three kinds are considered as the distance between P and Q along the road and the speed of Jiro an hour. Find both of them in all cases.

Answer