Final answer:
Maureen spends 15 minutes riding the train each day.
Step-by-step explanation:
To determine how long Maureen spends riding the train, we need to find the remaining time after she spends 75 minutes on the bus. Since the total time she spends riding the train and the bus each day is constant, we can subtract 75 minutes from the total time to find the time spent on the train. Let's assume the total time is 90 minutes:
Total time = 90 minutes
Time spent on bus = 75 minutes
Time spent on train = Total time - Time spent on bus
Time spent on train = 90 minutes - 75 minutes
Time spent on train = 15 minutes
Therefore, Maureen spends 15 minutes riding the train.