Sixth grade math, please help me, there will be a big reward!

1. Because the speed ratio of Beckham and Xiaomi is 2: 3, the time ratio of Beckham and Xiaomi is 3:2 at the same distance (the time ratio is inversely proportional to the speed ratio);

So Xiaomi went to Beckham's house and demanded: 50×2/3= 100/3 (minutes).

So Beckham walked the whole distance every minute: 1/50.

Xiaomi walks the whole distance every minute: 3/ 100.

So the elapsed time is:1÷ (1/50+3/100) = 20 (minutes).

2. Because one-third of Beckham's income is equal to one-half of Xiaomi's income, the quantitative ratio of the two is (inverse ratio):

1/2: 1/3=3:2

So Beckham has: 25×3/3+2= 15 (Ben)

Xiaomi has: 25- 15= 10 (Ben)

3. If you read 15 again, the content you read accounts for 2/3+2=2/5 of the whole book.

Now I have read a quarter of the book, so 15 accounts for 2/5- 1/4=3/20.

The whole book is: 15÷3/20= 100 (industry)

I wish you progress in your study! ~^_^