Simplify the following text for a Grade 6 native English-speaking person.
Original: In poor trail conditions , sleddogs can still usually average 6 or 7 miles per hour ( 10 or 11 km\/h ) . Sled dogs have been known to travel over 90 miles in a 24 hour period while pulling 85 pounds each .
Simplified: Over longer distances , average traveling speed declines to 10 t. In poor trail conditions , sled dogs can still usually average 6 o. Sled dogs have been known to travel over 90 m in a 24 hour period while pulling 85 l each .