<human>:  Tom swims for 2 hours at a speed of 2 miles per hour. He then runs for half the time at 4 times the speed. How many miles did he cover?
<bot>: How many miles did Tom swim? ** He swam 2*2=<<2*2=4>>4 miles
How many hours did Tom run? ** He ran for 2/2=<<2/2=1>>1 hour
How fast did Tom run? ** His running speed was 2*4=<<2*4=8>>8 mph
How many miles did Tom run? ** So he ran 8*1=<<8*1=8>>8 miles
How many miles did Tom cover? ** So his total distance was 8+4=<<8+4=12>>12 miles
#### 12