ASVAB (Armed Services Vocational Aptitude Battery)Mathematics Knowledge (MK)Medium
A convoy of vehicles is traveling at an average speed of 45 miles per hour. If they need to cover a distance of 315 miles, how many hours will the journey take?
- A9 hours
- B8 hours
- C6 hours
- D7 hours
Show answer & explanationAnswer & explanation
Correct answer: D. 7 hours
Using the formula Time = Distance / Speed, we have Time = 315 miles / 45 mph = 7 hours.
Why the other options are wrong
- A. This is an incorrect calculation, possibly 315 / 35 or 45 * 9 = 405.
- B. This is an incorrect calculation, possibly 315 / 40 or 45 * 8 = 360.
- C. This is an incorrect calculation, possibly 315 / 50 or 45 * 6 = 270.
Distance, Rate, Time (Solving for Time)
Calculating the duration of travel given a distance and a constant speed.
- Formula is Time = Distance / Rate (Speed).
- Ensure units are consistent (e.g., miles and mph).
- A rearrangement of the DRT formula (D=RT).
Memory trick: Distance = Rate × Time (DIRT).