JEE Advanced 2008 Chemistry question

Under the same reaction conditions, initial concentration of 1.386 mol dm⁻³ of a substance becomes half in 40 seconds and 20 seconds through first order and zero order kinetics, respectively. Ratio of the rate constants for first order () and zero order () of the reactions is

• (A)0.5 mol⁻¹ dm³Correct
• (B)1.0 mol dm⁻³
• (C)1.5 mol dm⁻³
• (D)2.0 mol⁻¹ dm³