'Long' ???? 10 miles long!!!!!
However, if you mean 'what is the time period.
Then
Speed = distance / time
Algebraically rearrange
time = distance / speed
Substitute
time = 10 miles/ 20 miles per hopur(mph) =>
time = 1/2 hours = 30 minutes
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1 hour = 60 mins time = distance ÷ speed = 5 miles ÷ 10 miles/hour = 0.5 hour = 0.5 x 6 mins = 30 mins.
Three hours (30/10 = 3).
7 miles every 10 minutes means 7 x 6 miles in an hour, so the speed is 42 mph.
It will take 20 min to go 20 miles at 60 mph.
25 minutes