Come up with a question and reasoning that would justify [10] as the answer.
The question is: To get to an island called "Virgo", Tom needs to travel by plane and then by boat. The plane trip is four times longer than the boat trip, and the boat trip takes up to 2 hours. In how many hours is Tom able to get to the "Virgo" island?
Reasoning: The plane trip is four times longer than the 2 - hour long boat trip, which means it takes 4 * 2 = 8 hours. So in total, the whole journey to "Virgo" islands lasts 8 + 2 = 10 hours.

Come up with a question and reasoning that would justify [21] as the answer.
The question is: Mr. John jogs for 1 hour 30 minutes in the morning every day. How much time (in hours) will he have spent jogging after two weeks?
Reasoning: There are 60 minutes in an hour so 1 hour 30 minutes is equivalent to [1 + (30 / 60)] hours = 1.5 hours. There are 7 days in a week so he spends 1.5 * 7 = 10.5 hours jogging every week. After 2 weeks he will have spent 2 * 10.5 = 21 hours jogging.

Come up with a question and reasoning that would justify [1350] as the answer.
The question is: There have been 15 "Where's Waldo?" books published. Each book has 30 puzzles to find Waldo. The average person takes 3 minutes to find Waldo in a puzzle. How long would it take to find every Waldo?
Reasoning: There have been 450 puzzles because 15 x 30 = 450. It would take 1,350 minutes to find all the Waldo's because 450 x 3 = 1,350.