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The answer to the new math lesson in the second volume of the fifth grade is 57-58 pages.
Party A does it alone for 6 hours, Party B does it alone for 4 hours, Party A does it for 30 minutes first, and then Party A and Party B do it together. How long will it take for Party A and Party B to complete the work together?

answer

It takes two hours for Party A and Party B to complete the work together, 12 minutes.

A train must cross the first and second iron bridges at a speed of 600 meters per minute. It takes five seconds longer to cross the second iron bridge than the first one, and it is known that the length of the second iron bridge is 50 meters shorter than twice that of the first one. Try to find out the length of the two iron bridges respectively.

answer

The length of the first iron bridge is100m, and the length of the second iron bridge is150m.

Jiangnan Eco-food Processing Factory has purchased a batch of mountain products, the quality of which is, according to the market demand, for rough processing and fine processing. It is known that the quality of refined mountain products is more than twice that of roughing, and the quality of roughing mountain products is better.

answer

2000 kg