एक प्रथम कोटि की अभिक्रिया के निम्नलिखित आकड़े प्राप्त हुए -
`{:(t//s,0,30,60,90),([A]//Mol L^-1,0.55,0.31,0.17,0.085):}`
`30` से `60` सेकेड समय अंतराल में औसत वेग की गणना कीजिए ।

In a pseudo first order hydrolysis of ester in water, the following results were obtained : {:(t(s),0,30,60,90),(["Ester"]("mol.L"^(-1)),0.55,0.31,0.17,0.085):} Calculate the average rate of reaction between the time interval 30 to 60s.