Final answer:
Ryan should drink about 2.25 liters of water to replace the 1.5 kg of weight he lost during the playoff game, as it's advised to drink 1.5 liters of water per kilogram of weight lost.
Step-by-step explanation:
Ryan is a hockey player who lost 1.5 kg of weight during a playoff game, and this question asks how much fluid he should drink to replace the amount he lost. When athletes lose weight during intense physical activity, it's primarily due to water loss through sweat.
A guideline commonly used is to replace each kilogram of body weight lost with approximately 1.5 liters of water. Thus, to replace the 1.5 kg of lost fluid, Ryan should aim to drink about 2.25 liters of fluid. It is important to rehydrate after intense exercise to restore the body's fluid balance and ensure proper recovery.