A electric tea kettle has two heating coils. When first coil of resistance \[{{R}_{1}}\]is switched on, the kettle begins to boil tea in 6 minutes. When second coil of resistance \[{{R}_{2}}\]is switched on, the boiling begins in 8 minutes. The value of \[{{R}_{1}}/{{R}_{2}}\]is

• A. \[\frac{7}{3}\]
• B. \[\frac{3}{7}\]
• C. \[\frac{3}{4}\]
• D. \[\frac{4}{3}\]