Several difficult mathematical problems 1. With a circumference of 60 meters, objects a and B move in the same direction from the same point along the far periphery at the same time (a is faster than B) and meet every 15 seconds. If they move in the opposite direction at the same point at the same time, they meet every 5 seconds to calculate the movement speed of objects a and B 2. repair a road, the individual manicure team needs 20 days to complete, the second team completes 12 days. The first team has been trained for a few days to transfer, and the second team continues to repair. It has been shared for 14 days from the beginning to the end of the repair. How many days have the team been repaired? 3. For a batch of parts, Master Zhang has to work for 20 hours, but master Wang has to work for 30 hours. If two people work at the same time, Master Zhang has 60 more parts than Master Wang. How many parts are there in total?

1.) V A = 8m / s, v b = 4m / S; 2.) a was made for 5 days; 3.) a total of 300 plants were produced

Difficult math problems It shows that 2008 ^ 2 + 2008 ^ 2 * 2009 ^ 2 + 2009 ^ 2 is a complete number