Mathematical energy conservation question?

A person takes a shower for 10 minutes. The water flow rate is 3 gallons per minute, and the temperature of the shower water is 110°F. Assuming th

A person takes a shower for 10 minutes. The water flow rate is 3 gallons per minute, and the temperature of the shower water is 110°F. Assuming the cold water is at 65°F, and the hot water from a 70% efficient gas water heater is at 140°F, how many cubic feet of natural gas does it take to provide the hot water for the shower?

or:A person takes a shower for 10 minutes. The water flow rate is 3 gallons per minute, and the temperature of the shower water is 110\u00b0F. Assuming the cold water is at 65\u00b0F, and the hot water from a 70% efficient gas water heater is at 140\u00b0F, how many cubic feet of natural gas does it take to provide the hot water for the shower?

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