1, the distance between Party A and Party B10km, with Party A in the front and Party B in the back. Party A travels 5km per hour and Party B travels 6km per hour. Two people set out in the same direction at the same time. How many hours can B catch up with A?

There are 3 different math books, 5 different Chinese books and 6 different English books on the bookshelf. (1) If you choose one of these books, how many different ways are there? (2) If you take a math book, a Chinese book and an English book from these books, how many different ways are there? (3) If you take two different subjects from these books, how many different ways are there?

The school held a basketball match. When playing 10 players shake hands with each other once. How many times does a * * * shake hands?

Xiao Lin cooks for his family. He chooses vegetables for 5 minutes, washes rice for 2 minutes, cooks 15 minutes and cuts vegetables for 4 minutes. If there is only one single burner gas stove, how many minutes will it take to complete these things at least?

5. Twenty-four trucks can transport 192 tons of goods at a time. How many tons can the same truck transport at a time?

6. Master Zhang plans to process 552 pieces and 345 pieces in the first five days. According to this calculation, how many days will it take to process this batch of parts?

7. Build a canal with a length of1.944m, 12 days for 54 people. If 18 people are added and the number of days is reduced to half of the original number, how many meters can the canal be built?