The significant figures correspond to the digits of a number, to count them we must take into account that the zeros at the beginning of a number do not count as significant figures.
When we do operations with numbers that contain different significant figures, the result must contain the smallest number of significant figures. That is, if a number has three significant figures and we multiply it by a number that has two significant figures, the result must contain two significant figures.
Let's see the operation of the question:
We have the following result:
1) 1.1 x10^3 m/s
2) 2.5 x10^3 mol/L
3) 1.3 mol