Use property of proportion:
miles time (hs) 90 2.25 x 1
x = 90 ÷ 2.25 x = 40 miles
Allen drove at a speed of 40 miles per hour after traveling 90 miles in 2 and 1/4 hours. To find this, we calculated his speed using the distance and time. Therefore, he drove 40 miles in one hour.
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