There are three trucks A , B , C. A loads 10 kg/min. B loads 13½ kg/min . C…
2024
There are three trucks A , B , C. A loads 10 kg/min. B loads 13½ kg/min . C unloads 5½ kg/min . If three simultaneously works then what is the time taken to load 2.18 tones?
- A.
2hours
- B.
1hour
- C.
2½ hours
- D.
1½ hours
Attempted by 16 students.
Show answer & explanation
Correct answer: A
Corrected solution:
Convert the rates to kg/min: A = 10 kg/min, B = 13½ = 13.5 kg/min, C unloads 5½ = 5.5 kg/min.
Net loading rate = 10 + 13.5 − 5.5 = 18 kg/min.
Total to load = 2.18 tonnes = 2180 kg.
Time = 2180 ÷ 18 = 121.111... minutes ≈ 121 minutes and 7 seconds ≈ 2 hours 1 minute.
Conclusion: The precise time is about 2 hours 1 minute. The option stating '2hours' is slightly low (about 1 minute short).