Unit of blood given over 4 hours contains 298 mls. how many mls per hour?

To find the milliliters per hour, divide the total volume of blood (298 mL) by the time in hours (4 hours).

298 mL ÷ 4 hours = 74.5 mL per hour.

Thus, the unit of blood is administered at a rate of 74.5 mL per hour.