একটি চৌবাচ্চায় দুটি নল সংযুক্ত আছে। প্রথম নল দ্বারা চৌবাচ্চাটি 4 মিনিটে পূর্ণ হয় এবং দ্বিতীয় নল দ্বারা 12 মিনিটে পূর্ণ হয়। নল দুটি একত্রে খুলে দিলে খালি চৌবাচ্চাটি কতক্ষণে পূর্ণ হবে?

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Job Solution Sonali Bank Ltd Sonali Bank Ltd - Officer (Cash) - 22.08.2014 গণিত
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