how do you solve this?

The candy indistry converts sucrose (C11H22O11,table sugar),a crystalline material, to invert sugar, a hydrolzyed [rpdict tjat os 50:50 frutose and glucose. The hydrolysis occurs in water, quite slowly, at an elevated temperature of 55¨¬C. The reaction is
C11H22O11 + H2)¡æC6H12O6(frutose)+C6H12O6(glucose)
from the following time course data, determine the ORDER of reaction.

Time/min [C11H22O11M]
0 0.50
60 0.40
137.4 0.30
180 0.26
274.8 0.18
300 0.16

I think the answer is 1st order