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

Options

A. 3 min 20 sec
B. 5 min
C. 7 min 30 sec
D. 2 min 30 sec

Answer

A

Explanation

In parallel-
`t = (t_(1)t_(2))/(t_(1) + t_(2)) = (10 xx 5)/15 = 3"min" 20 sec`