(2) Let Xiaoya catch up with Xiao Qiao in x minutes.

78X=65 * 5+65X

13X=325

X=25

(3)25 * 25 * 20= 12500 (cubic centimeter) 12500 cubic centimeter = 12500 ml = 12.5 liters.

(4) Set, put X lucky stars in the second bottle.

X+2X+ 10=208

3X= 198

X=66

So the first bottle contains 142 lucky stars, and the second bottle contains 66 lucky stars.