50x=40(x+ 1 1)

x=44

The road length is 50*44=2200cm.

2. Length 280÷2÷4+3÷4 = 80m.

Width 280 ÷ 2-80 = 60m

3. 1. It takes x hours to set Xiaolan.

10:x=4:5

4x=50

x= 12.5

10×2=20 hours

12.5×2=25 hours

2. Setup takes x hours.

( 1/20+ 1/25)x = 1

9/ 100 x= 1

x= 100/9