An electric kettle has two heating coils. When one coil is used, water in the kettle boils in $$5$$ minutes, while when second coil is used, same water boils in $$10$$ minutes. If the two coils, connected in parallel, are used simultaneously, the same water will boil in time

Question

Infinity Learn · Accepted Answer

In parallel $$1tp$$  $$=$$  $$1t1$$ $$+$$ $$1t2$$  ⇒  tp $$=$$ $$t1t2$$ $$t1+t2=5$$ × $$105$$ $$+$$ $$10$$  $$=$$ $$5015$$  $$=$$  $$3.33$$ min $$=3$$ min $$20$$  $$sec$$

An electric kettle has two heating coils. When one coil is used, water in the kettle boils in 5 minutes, while when second coil is used, same water boils in 10 minutes. If the two coils, connected in parallel, are used simultaneously, the same water will boil in time

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