152700 An electric kettle has two heating coils. When one of the coils is connected to an AC source, the water in the kettle boils in $10 \mathrm{~min}$. When the other coil is used the water boils in $\mathbf{4 0}$ min. If both the coils are connected in parallel, the time taken by the same quantity of water to boil will be
152700 An electric kettle has two heating coils. When one of the coils is connected to an AC source, the water in the kettle boils in $10 \mathrm{~min}$. When the other coil is used the water boils in $\mathbf{4 0}$ min. If both the coils are connected in parallel, the time taken by the same quantity of water to boil will be
152700 An electric kettle has two heating coils. When one of the coils is connected to an AC source, the water in the kettle boils in $10 \mathrm{~min}$. When the other coil is used the water boils in $\mathbf{4 0}$ min. If both the coils are connected in parallel, the time taken by the same quantity of water to boil will be
152700 An electric kettle has two heating coils. When one of the coils is connected to an AC source, the water in the kettle boils in $10 \mathrm{~min}$. When the other coil is used the water boils in $\mathbf{4 0}$ min. If both the coils are connected in parallel, the time taken by the same quantity of water to boil will be