Answer :

iGreen
Just divide 262.5 and 3 1/2.

262.5 / 3.5 = 75

So the car's speed was 75 miles per hour.
Hippalectryon
When at a constant speed V, you travel a distance D in a time T defined by D=V*T

Hence V=D/T=262.5/(3+1/2)=75

The car's speed is 75mph

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