You would express the answer of this problem in miles per hour (mph).
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840 miles
A plane will travel 840 miles if it flies at 210mph for 4 hours.
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.
Going in opposite directions, they separate at the rate of (90 + 120) = 210 miles per hour.They are 735 miles apart after (735/210) = 3.5 hours.
three hours are 180 minutes, so it took 210 minutes