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The transport shop of the association serves three branches A, B and C. Trucks transport products from A to B and from B to C, returning then to point A without cargo. The load at point A takes 20 minutes, moving from A to B takes 30 minutes, unloading and loading at point B – 40 minutes, moving to C – 30 minutes, unloading in C - 20 minutes and moving to A - 20 minutes. If there are no products in points A and B by the time of loading, trucks continue along the route without cargo. Products in A are produced in batches of 1000 pieces in 20±3 minutes, in B - in the same batches after 20±5 minutes. 8 works on the line trucks, each carrying 1,000 products. In primary school moment all trucks are placed at point A. Determine the frequency of empty truck races between points A and B and B and C.