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[" An electric Kettle has two heating co...

[" An electric Kettle has two heating coils.When one of them is switched on water "],[" in it boils in "6" minutes and when other is switched on water boils in "4" minutes."],[" In what time will the water boil if both coil are switched on simultancously "],[[" a) "1.6min," b) "2.8min," c) "2.4min," d) "3min]]

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