The answer to the question is 67.5 gal/h.
4.5 qt 60 min 1 gal 270 gal
---------- * ------------ * ----------- = ------------
1 min 1 hr 4 qt 4 hr
4.5 60 1 gal 270 gal
---------- * ------------ * ----------- = ------------
1 1 hr 4 4 hr
Answer
270 gal/ 4 hr = 67.5 gal/1 hr = 67.5 gal/hr
