Just divide 18.5 by 15! Gosh, lazy!!!
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32 MPH
35 miles per hour = 35 miles in 60 minutes = 35/2 miles in 60/2 minutes = 17.5 miles in 30 minutes.
35 miles in 1 hour or 60 minutes 12 minutes is 1/5th of an hour so in 12 minutes the distance traveled should also be 1/5th of the distance traveled in 60 minutes which is 7 miles
3 hours and 30 minutes = 3*60+30 = 210 minutes The planes is therefore going 1000/210 = 4.761904761904762 miles in a minute This means that the plane is going at a speed of 4.761904761904762*60 = 285.7142857142857 miles an hour.
30 miles.