An electric kettle has two coils. When one of these is switched on

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An electric kettle has two coils. When one of these is switched on, the water in the kettle boils in 6 minutes. When the other coil is switched on, the water boils in 3 minutes. If the two coils are connected in series, find the time taken to boil the water in the kettle.
20
Sep
An electric kettle has two coils. When one of these is switched on, the water in the kettle boils in 6 minutes. When the other coil is switched on, the water boils in 3 minutes. If the two coils are connected in series, find the time taken to boil the water in the kettle. An [...]
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Tags: An electric kettle has two coils. When one of these is switched on , find the time taken to boil the water in the kettle. , the water boils in 3 minutes. If the two coils are connected in series , the water in the kettle boils in 6 minutes. When the other coil is switched on ,