Final answer:
It will take Mr. Posillico 2 hours to ride his bike to work.
Step-by-step explanation:
To find out how long it will take Mr. Posillico to ride his bike to work, we first need to convert the distance traveled to meters. Since 1 kilometer is equal to 1000 meters, 50 km is equal to 50,000 meters.
Next, we can divide the total distance by the distance he can ride in an hour. Dividing 50,000 meters by 25,000 meters/hour gives us 2 hours.
Therefore, it will take Mr. Posillico 2 hours to ride his bike to work.