Dividing distance travelled by speed gives 70/9 = 7.7 recurring (that is, 7.7777...) hours or 7 hours 46 minutes 40 seconds.
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In 2 hours you travel 18 miles, so in half the time, 1 hour, you'll travel half the distance, 9 miles. So you've travelled at 9 miles per hour (9mph).
It would be about 6:23 or 6:40. :D
The average speed for the entire trip is 9mph.