Assuming that the driving time of cars A and B is t, then

56t=48t+32

t=4

Then s = 2 * 56t = 448km.

2. Suppose that car A travels x every hour.

kilometre (km)

Then you can know it by four and a half hours' drive from the title A bus to the West Station.

S = 4.5x times

The equation available is

(s+3 1.5)/x = s-3 1.5/(x- 12)

)

Available x=

3. suppose the speed of vehicle a is x.

Car b is y.

therefore

900=(x+Y)* 18 minutes

180(x-y)=900

4. suppose the distance is s.

therefore

(s+ 180)/90 =(s- 180)/60

s=900

5.