1. Both Party A and Party B set out from a to B at the same time at a speed of 15km / h. When Party A finds that the important goods are placed in a, they immediately return to get the goods and catch up with Party B. if the speed of returning and catching up with Party B is 1.2 times of the original speed, Party B's speed remains unchanged, and both of them reach B at the same time, the distance between two places of AB is calculated 2. When 100 g of 25% sulfuric acid solution is prepared with 50% and 10% sulfuric acid solution, how many g of 50% sulfuric acid solution is prepared?

1. Both Party A and Party B set out from a to B at the same time at a speed of 15km / h. When Party A finds that the important goods are placed in a, they immediately return to get the goods and catch up with Party B. if the speed of returning and catching up with Party B is 1.2 times of the original speed, Party B's speed remains unchanged, and both of them reach B at the same time, the distance between two places of AB is calculated 2. When 100 g of 25% sulfuric acid solution is prepared with 50% and 10% sulfuric acid solution, how many g of 50% sulfuric acid solution is prepared?

Question 1 may lack conditions, such as time
I can make the equation (x + y) / (1.2 * 15) + X / 15 = Y / 15 with equal time
X is the location where a finds the important items and Y is the total distance
y=11x
Two questions can be listed according to the total amount and quality of pure sulfuric acid
50%x+10%y=25%*100
x+y=100
x=37.5
y=62.5