Final answer:
The round trip took 1 hour and 55 minutes, including 46 minutes for the train journey and 1 hour and 9 minutes for the boat journey.
Step-by-step explanation:
To calculate the round trip time, we need to find the time taken by the train and the boat individually. Let's start with Abdul's journey to the amusement park:
Distance = 23 miles
Speed of train = Speed of boat + 10 mph
= 20 + 10
= 30 mph
Time taken by Abdul's train journey = Distance / Speed
= 23 / 30
= 0.7667 hours
= 46 minutes (approximately)
Now, let's calculate the time for Abdul's boat journey back:
Speed of boat = 20 mph
Time taken by Abdul's boat journey = Distance / Speed
= 23 / 20
= 1.15 hours
= 1 hour and 9 minutes (approximately)
The round trip time is the sum of Abdul's train and boat journey time:
Round trip time = Time taken by train journey + Time taken by boat journey
= 46 minutes + 1 hour and 9 minutes
= 1 hour and 55 minutes.