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