Xiaoling read 19 pages of the book on the first day and 25 pages on the second day. The ratio of the number of pages she read in the two days to the number of pages in the book is 1:4. How many pages does the book have?

There are 180 pages in total

A. The distance between two places is 60km. A starts from place a to place B by bicycle. One hour after starting, B goes from place a to place B by motorcycle, and B arrives 3 hours earlier than A. It is known that the speed of B is 3 times that of A. the speed of a and B should be calculated

Suppose the speed of a is XKM / h, then the speed of B is 3xkm / h. according to the meaning of the question, there is 60x = 603x + 4. Solve this equation and get x = 10. After testing, x = 10 is the solution of the original equation. When x = 10, 3x = 30. A: the speed of a is 10km / h, and the speed of B is 30km / h

A. The distance between the two places is 36 km. It is known that a rides a motorcycle at a speed of 60 km / h and B rides a bicycle at a speed of 12 km / h
If two people leave a and B at the same time and go in the same direction (B is in front of a), they can catch up with B after? Hours; question 2 if both people leave a for B, and a starts 2 hours after B, then a can catch up with B at? Km away from B

1 36 / (60-12) = 0.75 hours
2 36 - [(2 * 12) / (60-12)] * 60 = 6 km

A starts from a to B by bike at 12 kilometers per hour. Two hours later, B starts from a for several hours by motorcycle at 36 kilometers per hour
Catch up in a few hours

At the beginning, the distance difference between them was 12 × 2 = 24
Speed difference 36-12 = 24
Catch up time 12 × 2 △ 36-12 = 1
So one hour to catch up

Xiaoling read 19 pages of the book on the first day and 25 pages on the second day. The ratio of the number of pages she read in the two days to the number of pages in the book is 1:4. How many pages does the book have?