A tap can fill the tank in 15 minutes and another can empty it in 5 minutes. If the tank is already half -full and both the taps are opened together , how many minutes will the tank take to be emptied?

A 8
B 12
C 16
D None of these

Correct Answer: 8

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#উচ্চতর গণিত #বিপরীত ত্রিকোণমিতিক ফাংশন ও ত্রিকোণমিতিক সমীকরণ (Inverse Trigonometric Functions and Trigonometric Equations) #B ইউনিট #খুলনা বিশ্ববিদ্যালয়

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