৫ ঘন্টা ২০ মিনিট
৪ ঘন্টা ৪০ মিনিট
৪ ঘন্টা ২০ মিনিট
কোনটিই নয়
Source: পরিবার পরিকল্পনা অধিদপ্তর - উপসহকারী কমিউনিটি মেডিকেল অফিসার (12-12-2014)
Answer: ৪ ঘন্টা ৪০ মিনিট
Explanation:
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দুইটি নল দিয়ে একটি চৌবচ্চা ৮ মিনিটে পূর্ণ হয়। নল দুইটি খুলে দেয়ার ৬ মিনিট লাগলে দ্বিতীয় নলটি দিয়ে চৌবাচ্চাটি একক ভাবে পূর্ণ করতে কত মিনিট লাগবে?
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