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1: If the bus starts from a for 9 hours, the distance between the two vehicles is 3000 km. How many meters is the distance between a and B 2: Car a and car B leave from city a and city B at the same time, and they can meet each other in six hours. Now car a starts from city a, and it's 210 kilometers away from city B one hour later. Car B starts from city B, and it's 230 kilometers away from city a one hour later. How many kilometers are there between city a and city B 3: A batch of pesticides was transported to a village. 4 / 7 of the total amount was used in the first day, 12 kg more than twice the amount used in the second day. At this time, the ratio between the amount used and the rest is 27:8. How many kg does this batch of pesticides weigh 4: A truck team transported a batch of cement from the factory to the construction site. On the first day, it transported more than 1 / 4 7 tons of all cement, and on the second day, it transported the remaining 2 / 5 more than 2 tons. At this time, it transported 5 / 18 of all cement. How many tons of original cement 5: After 1 / 3 of the coal in pile a and pile B is transported to pile B, 40% of the coal is transported from pile B to pile A. at this time, there are 48 tons in pile a and 42 tons in pile B. how many tons of coal are there in pile a and pile B
（1）3000/2*7
（2）440/5*6
(3) Now used -------- 27 / 27 + 8 = 27 / 35
Used the next day: 27 / 35-4 / 7 = 1 / 5
Let x kg be the total
4/7x=1/5x*2+12
(4) Transported: 1-5 / 18 = 13 / 18
Set the original x tons
1/4x+7+【1-（1/4x+7）】*2/5+2=13/18
(5) After the first operation of B reactor, 42 / 60% = 70t
B to a: 70-42 = 28T
2 / 3A -------- 48-28 = 20t
So the original a -------- 20 / (2 / 3) = 30t
Original B: 48 + 42-30 = 60t
(3) (4) set up the equation and calculate it yourself
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