Taro and Jiro leave A point at the same time walk to B point.
The speed along which Taro and Jiro walk is constant respectively and the ratio of speed is Taro : Jiro = 7 : 5.
18 minutes after Taro arrived at B point, Jiro arrived at B point.
(1) After Taro arrived at B point, he rested for 10 minutes.
Then he went to A point with the same speed before resting.
How many minutes did it take after leaving B point for Taro to meet Jiro?
(2) Find the time which it takes when Jiro goes back and forth between AB points by 3 times faster than the speed Jiro walked.