tom has been training for a race.he completes his training by running full speed at 9mph and walks back same distance at 3mph .how long should he plan on walking back?

Answer 1

3 times as long walking back as running the same distance. 9/3 = 3

Are you sure there isn't more information to the problem?

If he ran 9 miles, he'd have run 1 hour, then walk back in 3 hours

If he ran 18 miles, he'd have run 2 hours then walk back in 6 hours

As it is, there is no specific time period in either direction.