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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3 min 20 sec

5 min

7 min 30 sec

2 min 30 sec

answer is A.

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Detailed Solution

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

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