We know that;
power=W/t
15000Watts=1800000J/t
t=1800000J/15000Watts
t=120s
OK.
But first we need to know . . .
-- Where is Riverdale ?
-- What is the air temperature there right now ?
-- What kind of system is being used now ?
-- Where can we get a complete description of the groundwater system ?
Your answer is c hope I helped
