These are sample practice MCQs created for exam preparation. These are NOT official exam questions.
If Machine A can complete a task in 6 hours and Machine B can complete the same task in 4 hours, how long will it take both machines working together to complete the task?
Question:
If Machine A can complete a task in 6 hours and Machine B can complete the same task in 4 hours, how long will it take both machines working together to complete the task?
If Machine A can complete a task in 6 hours and Machine B can complete the same task in 4 hours, how long will it take both machines working together to complete the task?
Options
Answer: (B) 2.4 hours
Explanation:
Machine A rate = 1/6 per hour, Machine B rate = 1/4 per hour. Combined rate = 1/6 + 1/4 = 2/12 + 3/12 = 5/12 per hour. Time = 1 ÷ (5/12) = 12/5 = 2.4 hours.
Explanation:
Machine A rate = 1/6 per hour, Machine B rate = 1/4 per hour. Combined rate = 1/6 + 1/4 = 2/12 + 3/12 = 5/12 per hour. Time = 1 ÷ (5/12) = 12/5 = 2.4 hours.
👉 Want AI explanation? Open in MCQ App
Recommended articles
- Hppsc Previous Year Questions (2021–2025) Free Practice — Practice HPPSC Himachal Pradesh PSC Prelims Paper 1 Previous Year Questions (2021–2025) online at UPSC Quizroom. Bilingual Hindi-English, AI explanations,…
- Daily Upsc Mcq Strategy — '); animation: float 20s ease-in-out infinite; pointer-events: none; } @keyframes float { 0%, 100% { transform: translate(0%, 0%) rotate(0deg); } 50% {…
- Free Cat Previous Year Questions Guide — Master CAT 2025 with free previous year questions. Practice 1000+ PYQs, mock tests, and detailed solutions. Complete guide to CAT preparation using past…