JEE Previous Year Question

During Kinetic study of reaction $2A+B\to C+D$, the following results were obtained :

$A\text{[}M\text{]}$
$B\text{[}M\text{]}$
initial rate of
I
0.1
0.1
$6.0\times {10}^{-3}$
II
0.3
0.2
$7.20\times {10}^{-2}$
III
0.3
0.4
$2.88\times {10}^{-1}$
IV
0.4
0.1
$2.40\times {10}^{-2}$
Based on above data, overall order of the reaction is_____

Topic: JEE PYQ

Answer: 3. Full step-by-step solution below.