Working independently, Salam can perform a certain task in 6 hours and Tonny can perform it in 7 hours. If Salam and Tonny work together for 3 hours, and then Salam leaves, how many hours will it take Tonny to complete the task alone?
A. 1/14
B. 2/5
C. 1/2
D. 29/42
E. 1
DUIBAসাধারণ গণিতপরিমাপসমস্যা সমাধান (আয়তাকার ঘনবস্তু, ঘনক, সিলিন্ডার) (Topic Practice)DU - ⚡ অনলাইন প্রশ্নব্যাংক দেখুন 💥
Explanation: Salam's rate of work = 1/6 and that of Tonny = 1/7. Together their rate of work = \(1/6 + 1/7 = 13/42\). Working together for 3 hours they complete \(3 \times (13/42) = 13/14\) parts of the work. So, remaining work = \(1 - 13/14 = 1/14\). So, Tonny will take \((1/14) / (1/7) = 1/2\) hours to complete the work.
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