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Q.

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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a

3 min 20 sec

b

5 min

c

7 min 30 sec

d

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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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