A man runs east at 6.6m/s, for 13s, stops for 2.7s, then runs back west at 4.4m/s for 4.0s. what

a man runs east at 6.6m/s, for 13s, stops for 2.7s, then runs back west at 4.4m/s for 4.0s. what is the mans avergae velocity