During the dinner rush a certain restaurant cooks about 25 pounds of spaghetti per hour. How many grams do they cook second?

EXPLANATION:

First convert pounds to kilograms: $$25\text{ lbs}\left(\frac{0.4536\text{ kg}}{1\text{ lb}}\right)=11.34\text{ kg}$$

Then convert kilograms to grams: $$11.34\text{ kg}\left(\frac{1000\text{ g}}{1\text{ kg}}\right)=11340\text{ g}$$

Finally, divide grams by seconds per hour to find grams per second: $$\frac{11340\text{ g}}{3600\text{ s}}=\boxed{3.15\text{ g/s}}$$