Answer
$2,700,000,000\ gal/hr$
Work Step by Step
$\frac{7.5\times10^5\ gal}{1 sec} \times \frac{3600 sec}{1\ hr}$ $\longrightarrow$multiply the coefficients
=$27000\times10^5\ gal/hr$ $\longrightarrow$move the decimal 5 places to the rigjht
=$2,700,000,000\ gal/hr$
