Janet runs and walks the 3 miles from home to work each day . She runs the first 2miles at 8mph and walks the rest at 4mph.how long does it

2 miles/8 miles an hour=1/4; 1/4 of an hour = 4 miles per hour for last mile = 15

15 + 15 = 30, it took her 30 minutes to get to work

Whoops, ignore that. My sister was doing a test answer but she got it wrong.

It takes her 15 minutes to run the first two miles and 15 to walk the third mile. It takes her 30 minutes total. Her average speed is 6 miles per hour (6mph).