Milo can roll downhill on his skateboard at twice the speed that he can run.  And Milo's best friend, Cory, can drive his wheelchair at twice the speed that Milo can roll downhill on his skateboard.  If Cory always drives his wheelchair at 12 miles per hour, how many miles can Milo run in two hours?
Since Cory drives his wheelchair at 12 miles per hour, then Milo rolls downhill on his skateboard at 12/2 = <<12/2=6>>6 miles per hour.
Therefore, Milo runs at 6/2 = <<6/2=3>>3 miles per hour.
If Milo runs for 2 hours at 3 miles per hour, then Milo will travel 2 * 3 = <<2*3=6>>6 miles.
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