is it possible to bike 6 miles in an hour and a half?

Should be easily possible. A person walking at a brisk pace could probably make close to 6 miles in 1.5hrs - with a bike, even riding slowly, it shouldn't take you more than an hour to go 6mi.
 
You should be able to do it in an hour or less if you don't have any steep hills to climb. 6 mph is very easy to do on level ground.
 
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