Reasoning and answer: Every second month Nina does twice the regular distance, which means 400 * 2 = 800 kilometers. Two years is 24 months, so half of this time is 24 * 0.5 = 12 months. So in 12 months Nina does 400 * 12 = 4800 kilometers. And in the other 12 months, she does 800 * 12 = 9600 kilometers. So in two years, Nina would be able to make 4800 + 9600 = 14400 kilometers.
The answer: 14400
What was the question?
Question: Nina loves to travel. She tries to travel at least 400 kilometers in one month outside of her home country. Every second month she does twice that distance. If she were able to keep up with her resolution, how many kilometers would she travel during 2 years?

Reasoning and answer: Martha's car gets 20 / 2 = 10 miles per gallon. Total gallons Martha's car requires is 300 / 10 = 30 gallons.
The answer: 30
What was the question?
Question: Darlene's car gets 20 miles/gallon. Martha's car gets half as many miles per gallon as Darlene's car. How many gallons does Martha's car require to make a 300-mile trip?

Reasoning and answer: Kelly is 72 - 3 = 69 inches tall. Jana is 69 + 5 = 74 inches tall.
The answer: 74
What was the question?
Question:
Jana is 5 inches taller than Kelly, and Kelly is 3 inches shorter than Jess. If Jess is 72 inches tall, how tall is Jana?