Here, we are to find the speed of mark in miles per hour.
The speed of Mark in miles per hour is 12 miles per hour.
Total distance Mark travelled = 6 miles
Total time taken = 30 minutes
convert minutes to hour
60 minutes = 1 hour
30 minutes = 1/2 hour = 0.5 hour
Speed = distance ÷ time
= 6 miles ÷ 0.5 hour
= 12 miles per hour
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