3×(x+ 1.5x)=285

x=38 1.5×38=57

This truck travels 38 kilometers per hour. The bus travels 57 kilometers per hour.

2. Solution: 75+68= 143 yuan.

143x1.08 =154.4 yuan.

A: This suit is equivalent to RMB 154.4.

3. Solution: 240-81.6 =158.4km.

158.4 ÷ 2.2 = 72km/h

This car travels 72 kilometers per hour.

4. Solution: Suppose X months:

2(500+50x)=720+ 120x

x= 14

A: 14 months later.