Answer:
He drove approximately 478.78 km
Explanation:
We know that,
Distance = Speed × time,
Given,
Time taken by john in driving = 3.5 hours,
His average speed = 85 mph,
So, the total distance he drove = 3.5 × 85 = 297.5 miles,
Since, 1 miles = 1.60934 km,
Thus, the total distance he drove = 1.60934 × 297.5 = 478.77865 km ≈ 478.78 km