If an electric heater is rated at $1000\, W$, then the time required to heat one litre of water from $20\,^oC$ to $60\,^oC$ is
If an electric heater is rated at $1000\, W$, then the time required to heat one litre of water from $20\,^oC$ to $60\,^oC$ is
- A
$1\, min\, 24\, sec$
- B
$2\, min\, 48\, sec$
- C
$4\, min\, 17\, sec$
- D
$5\, min\, 36\, sec$
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