I think your diet affects your results more than your workout. Exercise is important, no arguments there, but when it comes to weight loss, the results you see well be 20% how much you worked out and 80% how clean you kept your diet.
With that said, you’ll get better results by not splitting your workout to three times a day. In general, the first 20 minutes of a workout is burning the glycogen stored in your blood. Once the glycogen is gone, your body turns to other sources of energy, ie. fat deposits.
With your proposed plan, you would burn up your glycogen, then stop before your body could burn your fat. And then you repeat it again later, and then one more time. Why waste your time and energy when you can workout just 40–45 minutes in one shot and make your workout more effective?
If you want better results, exercise once a day, but up your weekly workouts to 5–6 days instead of only 3 (I’m assuming you’re only doing cardiovascular exercise. If you’re doing weights, the number needs to less frequent).