Answer
Please see the work below.
Work Step by Step
(a) We know that $t=1minute =(\frac{1}{60})h$
So the power is
$P=\frac{Energy}{time}=\frac{1KWh}{(\frac{1}{60})}=60KW$
(b) Time in hours is
$t=1h$
$P=\frac{Energy}{time}$
$P=\frac{1KW.h}{1h}=1KW$
(c) We know that
$t=1day=24h$
$P=\frac{Energy}{time}=\frac{1KWh}{24h}=0.042KW$
