1。 Supermarket anniversary celebration, carry out preferential activities. Buy 1 bottle of milk tea 3.5 yuan, buy 5 bottles and send 1 bottle; Buy melon seeds at the price of 10 yuan, and each package contains 10. Buy 1, get 1. Buy pork breast in a package of 19 yuan, and each package has a small package of 10. Xiaoli brought 200 yuan snacks for 30 people. How can Xiaoli buy it and how much money can she get back at most?

Milk tea; Buy 4 and drink 5, each person drinks 1 bottle. Need to buy: 30÷5x4=24 bottles, price: 24x3.5=84 (RMB).

Guazi: I need to buy 3 packs: 60 packs for one * * *, 2 packs for each person. The price is 10x3=30 (RMB).

I need to buy 3 packs of pork breast, each pack 1 pack. Price: 19x3=57 (RMB)

At most: 200-84-30-57=29 (yuan)

2。 There was a camping training in the fifth grade, walking an average of 4 kilometers per hour. 1.5 hours later, Mr. Wu forgot to bring anything, so he rode Xiaoming back to school to get it. The speed of the bicycle is 16 km per hour. How many minutes will Xiaoming return to the team?

1.5 hour student travel: 1.5x4=6 (km)

Bicycle return time: 6/ 16=3/8 (hours)

3/8 hours of student travel; 5/8x4 = 2.5km.

Student * * * line; 6+2.5 = 8.5km.

Cycling catch-up time: 8.5( 16-4)= 17/24 (hours).

Xiao Ming's returning time: 5/8+ 17/24=4/3 (hours).