600/X+(4800-600)/2x=9
5400/2x=9
x=300
2. Let the speed of the first team be x km/h..
90/X=90/ 1.5X+0.5
45/ 1.5X=0.5
X=60
The speed of the second team is 1.5X, which is 90km/h.
3. a set of nectarines is x yuan a catty
80/X-5=80/2X
40/X=5
X=8
The price of cherries is 2X, that is, 16 yuan a catty.