Distance in minutes — Aptitude Question
Distance in minutes: A cyclist rides at 18 km/h. How far does he travel in 40 minutes? Answer and worked solution on CodeKairo.
- Topic: Time, Speed & Distance
- Section: Quantitative Aptitude
- Difficulty: Easy
- Time target: 40 seconds
Question
A cyclist rides at 18 km/h. How far does he travel in 40 minutes?
Options
- 9 km
- 10 km
- 12 km
- 15 km
Show the answer and the worked solution
Correct answer: C. 12 km
Worked solution
- Time = 40/60 = 2/3 hour.
- Distance = 18 × 2/3 = 12 km.
Answer: 12 km.
The idea
Convert minutes to a fraction of an hour before multiplying. Fractions are safer than decimals when the minutes are not a round tenth.
Shortcut. 18 km/h is 0.3 km a minute, so 40 minutes give 40 × 0.3 = 12 km.
Common trap. 9 km is where writing 40 minutes as 0.4 h leads: 18 × 0.4 = 7.2 km, and 9 km is the nearest option. 40 minutes is 2/3 h, so the distance is 18 × 2/3 = 12 km.