Answer: 44-24 = 20 minutes
Step-by-step explanation:
Time spent going back to the car = 12 minutes .
Since the distance between the car and the bird-watching spot didn't change, this means it must have taken him 12 minutes to get to the specific spot he stood at.
12 minutes (going to spot) + 12 minutes (coming back from spot)
= 24 minutes
44 minutes (bird-watching) - 24 minutes (walking to and from the car)
= 20 minutes longer spent bird-watching than walking back and forth to the car