John trains for ultramarathons.  He starts only able to run 8 hours straight but eventually increases that by 75%.  He also increases his speed of 8 mph by 4 mph.  How far can he run now?
He increases the time he can run by 8*.75=<<8*.75=6>>6 hours
So he can now run 8+6=<<8+6=14>>14 hours
His speed is now 8+4=<<8+4=12>>12 mph
So he can run 14*12=<<14*12=168>>168 miles
#### 168