To calculate Oscar's speed, we can use the formula:
Speed = Distance ÷ Time
where distance is measured in miles and time is measured in hours.
In this case, Oscar traveled 215 miles in 5 hours. So we can plug these values into the formula and get:
Speed = 215 miles ÷ 5 hours
Speed = 43 miles per hour
Therefore, Oscar the ostrich traveled at a speed of 43 miles per hour on land.