ASVAB (Armed Services Vocational Aptitude Battery)Mathematics Knowledge (MK)Easy
An artillery observer calculates the range to a target. If the target is 8 kilometers away and the shell travels at an average speed of 400 meters per second, how long will it take for the shell to reach the target?
- A40 seconds
- B80 seconds
- C10 seconds
- D20 seconds
Show answer & explanationAnswer & explanation
Correct answer: D. 20 seconds
First, convert kilometers to meters: 8 km * 1000 m/km = 8000 m. Then, use the formula time = distance / speed. So, 8000 m / 400 m/s = 20 seconds.
Why the other options are wrong
- A. Possible error in unit conversion or division.
- B. Incorrect conversion and/or calculation error.
- C. Incorrect conversion or calculation error.
Time, Distance, Speed Relation
The relationship between time, distance, and speed is fundamental in physics and everyday calculations. Distance is the product of speed and time.
- Distance = Speed × Time
- Speed = Distance / Time
- Time = Distance / Speed
Memory trick: Time is the 'D'istance over 'S'peed, like a 'D'ivision 'S'ign.