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