Here, "r" is the radius of the Earth (approximately 6378 km), and "latitude" represents the latitude at which the distance is being measured.
Plugging in the value of 10 degrees for latitude, we have:
Distance = (2π x 6378 km / 360) * cos(10°)
Calculating this expression, we get:
Distance ≈ 110.57 km
Therefore, at 10 degrees latitude, the distance per degree of longitude is approximately 110.57 kilometers.