Solution: 1 When the school accommodation department arranges accommodation for students, if there are 7 people in each room, there are 3 beds missing; If there are eight people in each room, there are five beds. In this problem, the known number is (

Number of people in each room

), the unknown is (

overall number of people

), the equation relationship is: (1) (

)(2)(

) Set up a dormitory with a small number of X rooms.

7x+3=8x-5

x=87*8+3=59

Question 2: Time difference 12 minutes.

That is 0.2 hours.

Shangpo road x

Downhill y

X/35+y/28-x/35+y/28=0.2 hours

When I go.

X/35+y/28+(142-x-y)/30 = 4 hours and 30 minutes.

Find xy

Set the uphill x km, downhill y km and flat road z km.

Equation 1: X/28+Y/35+Z/30=9/2.

Equation 2: X/35+Y/28+Z/30=47/ 10.

Solution: X=Y-28

Substitute into the equation X+Y+Z= 142.

Get Z= 170-2Y.

Substitute the values of x and z into the equation 1.

(Y-28)/28+Y/35+( 170-2Y)/30 = 9/2

Y=70，X=70-28=42，Z= 170-2*70=30。

A: The uphill and downhill roads should be 42m, 70m and 30m respectively.