2. Solution: Set the fast horse to catch up with the slow horse within X days.
240 x = 150 x+( 150 x 12)
240x- 150x= 1800
X=20 A: Fast horses can catch up with thin horses in 20 days.
3. Solution: Suppose two people meet for the first time after X minutes.
350x+250x=400
600x=400
X = 1.5 A: 1.5 hours later they met for the first time.
4.( 1) A: Enter it 40 times, and it's the same.
(2) Answer: If you enter for less than 40 times, you'd better not buy a membership card.
(3) Answer: It is better to buy a membership card if you enter for more than 40 times.
6 is the degree of minute hand walking per minute, and 0.5 is the degree of hour hand walking per minute.
( 1)6x-0.5x=90
(2)6x-0.5x=90+ 180
(3)6x-0.5x= 180
High score! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !