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 $$\left(\frac{k_1}{k_0}\right)$$ of the rate constants for first order $$(k_1)$$ and zero order $$(k_0)$$ of the reactions is

A

0.5 mol$$^{-1}$$ dm$$^{3}$$

B

1.0 mol dm$$^{-3}$$

C

1.5 mol dm$$^{-3}$$

D

2.0 mol$$^{-1}$$ dm$$^{3}$$