Change speed to catch up

The way from the house of Taro and Jiro to the school joins at the point A, as shown in a figure.

As for the distance to A point, Taro’s house is more 750 m far than Jiro’s house.

Moreover, it is 1000 m from A point up to the school.

Usually, Taro leaves home at 7:50 in the morning, goes at 100 m/m to school and reaches 5 minutes before the starting time.

Usually, Jiro passes along A point 7 minutes later than Taro and reaches exactly at the starting time.

Since it was 5 minutes late to leave home today, Jiro ran at the twice the speed of usual.

Jiro caught up with Taro at the middle point between A point and school.

Answer the following questions.

(1) Find the speed at which Jiro usually walks.

(2) Find the time delayed Jiro passed through A point than Taro today.

(3) Find the distance between Jiro’s house and A point.

(4) Find the starting time of the school.

Answer