Fourth, solve the problem 1, from A to B, it takes 90 minutes for trucks and 80 minutes for buses. It is known that trucks travel 34 kilometers per minute, and how many kilometers per minute do buses travel? There used to be 89 tons of coal in the school canteen. The average daily coal consumption in the first two days was 4 1 ton. It will burn in the next three days. How many tons will it burn on average every day? 3. Weight of a barrel of oil15kg. Pour out 52% of it, and put the remaining oil into 12 bottles on average. How many kilograms are there in each bottle? There are two harvesters. The first harvester harvested 3 hectares of wheat in 32 hours, and the second harvester harvested 2 hectares of wheat in 32 hours. How many hours does it take to harvest 90 hectares of wheat with these two harvesters at the same time? 5. Xiao Min is reading. On the first day, he read six pages, and then read four more pages every day than the day before. Three days later, he only read 83 parts of the book. If he keeps reading like this, it will take at least a few days to finish reading the book. 6. The fruit shop bought 15 kg of apples. 32 apples were sold, and the basket weighed 8 kilograms. How much does this basket weigh? 7. There are 60 math interest groups in Sunshine Primary School, and the number of writing interest groups is equivalent to 125. How many students have been added to the writing interest group, which is 54% of the number of math interest groups? 8. Last semester, there were 530 students in Grade 5 and Grade 6 in Xin Lei School. This semester, there are 20 students in Grade 5 and 30 students in Grade 6. The number of fifth-grade students in this semester is 32 in sixth grade. How many students were there in Grade 6 of Xin Lei School last semester?