Subject
Quantitative Aptitude
Topic
Pipes & Cistern
Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively.Both the pipes are opened together but after 4 minutes ,pipe A is turned off .What is the total time required to fill the tank?
Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively.Both the pipes are opened together but after 4 minutes ,pipe A is turned off .What is the total time required to fill the tank?
ক)
10 min 20 secখ)
11 min 45 secগ)
12 min 30 secঘ)
14 min 40 secExplanation
(প্রশ্ন- দুটি পাইপ A ও B একটি ট্যাংক পূর্ণ করতে পারে যথাক্রমে ১৫ মিনিট এবং ২০ মিনিটে।উভয় পাইপ ৪ মিনিটের জন্য খোলা হলো এবং এরপর পাইপ A বন্ধ করে দেওয়া হলো।ট্যাংকটি পূর্ণ হতে মোট কত সময় লাগবে?) ৪ মিনিটে A এবং B এক সাথে পূর্ণ করে =(১/১৫)+(১/২০)×৪ =(৪+৩)/৬০ ×৪ =৭/১৫ বাকি অংশ = ১ - (৭/১৫)=৮/১৫ অংশ বাকি অংশ B এর পূরণ করতে সময় লাগবে=(৮/১৫)×২০ মিনিট =৩২/৩ =১০(২/৩) =১০ মিনিট ৪০ সেকেন্ড অতএব মোট সময় লাগবে, =(৪+১০ মিনিট ৪০ সেকেন্ড) =১৪ মিনিট ৪০ সেকেন্ডRelated questions
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