A geothermal aquifer supplies hot water to a town with a well-head temperature of 75°C at a flow rate of 18 liters/s (equivalent to 18x10​ -3 m 3 /s). Without this source, water would have to be...

A geothermal aquifer supplies hot water to a town with a well-head temperature of 75°C at a flow rate of 18 liters/s (equivalent to 18x10​^-3
m³/s). Without this source, water would have to be heated by oil furnaces from a base temperature of 15°C. If the efficiency of the oil furnaces is 75% and the geothermal heat is used for 170 days each year, how much oil is saved each year?