Answer
(a) Work is done at the rate of $3600~J/s$
(b) $Work = 5.4~J$
Work Step by Step
(a) We can find the power delivered by the electric organs:
$P = V~I$
$P = (200~J/C)(18~C/s)$
$P = 3600~J/s$
Work is done at the rate of $3600~J/s$
(b) We can find the work done during one pulse:
$Work = P \times t$
$Work = (3600~J/s)(1.5\times 10^{-3}~s)$
$Work = 5.4~J$
