BARB Work Rate 1 — Questions and Answers
Question 1: Soldier A can pack 60 supply crates in 3 hours. What is his rate per hour?
- 15 crates/hr
- 30 crates/hr
- 20 crates/hr (Correct answer)
- 25 crates/hr
Correct answer: 20 crates/hr
Rate = 60 ÷ 3 = 20 crates per hour.
Question 2: Two soldiers together dig a trench at a combined rate of 4 metres per hour. How long to dig 20 metres?
- 6 hours
- 4 hours
- 3 hours
- 5 hours (Correct answer)
Correct answer: 5 hours
Time = 20 ÷ 4 = 5 hours.
Question 3: Recruit X assembles 5 kits per hour and Recruit Y assembles 3 kits per hour. How many kits do they assemble together in 4 hours?
- 28 kits
- 30 kits
- 32 kits (Correct answer)
- 24 kits
Correct answer: 32 kits
Combined rate = 8 kits/hr; Total = 8 × 4 = 32 kits.
Question 4: A team of 4 soldiers loads a truck in 2 hours. How long would it take 8 soldiers working at the same rate?
- 30 minutes
- 45 minutes
- 1 hour (Correct answer)
- 1.5 hours
Correct answer: 1 hour
Doubling the workforce halves the time: 2 ÷ 2 = 1 hour.
Question 5: One machine fills 120 sandbags in 6 hours. A second machine fills 180 sandbags in 6 hours. How many sandbags do both machines fill together in 6 hours?
- 280
- 320
- 300 (Correct answer)
- 260
Correct answer: 300
120 + 180 = 300 sandbags in 6 hours.
Question 6: Which formula correctly expresses work rate when total work (W) and time (T) are known?
- Rate = W × T
- Rate = T ÷ W
- Rate = W + T
- Rate = W ÷ T (Correct answer)
Correct answer: Rate = W ÷ T
Work Rate = Total Work ÷ Time.
BARB Work Rate 1
Soldier A can pack 60 supply crates in 3 hours.
What is his rate per hour?