90 miles per hour.
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None, but there are 450 minutes in 71/2 hoursTo find this:Divide 450 by 60 (450 / 60)That equals 7.5.But how do we calculate this as precise hours and minutes?Take 7.5; this is 7.5 hours. The .5 is a half; so what's half of an hour? 30 minutes?So this becomes 7 hours and 30 minutes.Short method:450 / 60 = 7.5 = (.5 means half so 30 mins) = 7 hours and thirty minutes.
Speed = distance/time so it is 450/5 = 90 km per hour.
252 miles in 5 hours and 15 minutes = 48 mph
20/5 = 4 miles per hour
divide 2250 by 5 to get 450