Final answer:
In the equation 50t + 3w = 150, 3w represents the distance Jennifer travels by walking in 3 hours.
Step-by-step explanation:
In the equation 50t + 3w = 150, the term 3w represents the distance Jennifer travels by walking. Since w represents the number of hours she spends walking, 3w represents the distance she walks in 3 hours. This is because the rate of walking is constant, so if Jennifer walks for 1 hour and covers a certain distance, she would walk 3 times that distance in 3 hours.