Subject
Quantitative Aptitude
Topic
Pipes & Cistern
Two pipes A and B can fill a tank in 12 minutes and 15 minutes respectively. If both the pipes are opened simultaneously and pipe A is closed after 3 minutes, then how much more time will it take to fill the tank by pipe B? (দুটি পাইপ A এবং B যথাক্রমে 12 এবং 15 মিনিটে একটি ট্যাংক পূর্ণ করতে পারে । যদি উভয় পাইপ খুলে দেয়া হয় এবং 3 মিনিট পর পাইপ A বন্ধ করে দেওয়া হয়, তাহলে ট্যাংকটি পূর্ণ করতে B এর কত সময় লাগে ?)
Two pipes A and B can fill a tank in 12 minutes and 15 minutes respectively. If both the pipes are opened simultaneously and pipe A is closed after 3 minutes, then how much more time will it take to fill the tank by pipe B? (দুটি পাইপ A এবং B যথাক্রমে 12 এবং 15 মিনিটে একটি ট্যাংক পূর্ণ করতে পারে । যদি উভয় পাইপ খুলে দেয়া হয় এবং 3 মিনিট পর পাইপ A বন্ধ করে দেওয়া হয়, তাহলে ট্যাংকটি পূর্ণ করতে B এর কত সময় লাগে ?)
ক)
7 min 15 secখ)
7 min 45 secগ)
8 min 5 secঘ)
8 min 15 secExplanation
A ও B 1 মিনিটে পূর্ণ করে (1/12 + 1/15) অংশ A এবং B 3 মিনিটে পূর্ণ করে = (1/12 + 1/15) × 3 = (5+4/60)×3 = 9/20 অংশ বাকি অংশ = (1-9/20) = 11/20 অংশ B(1/15) অংশ করে 1 মিনিটে 11/20 অংশ পূর্ণ করতে B এর সময় লাগবে = (11/20×15/1) মিনিট = 11×3/4 = 33/4 = 8(1/4) মিনিট = 8 মিনিট 15 সেকেন্ড ।Related questions
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