alleryদুটি পাইপ যথাক্রমে 20 এবং 30 ঘণ্টায় একটি চৌবাচ্চা পূর্ণ করে এবং একটি তৃতীয় পাইপ 60 ঘণ্টায় এটি খালি করে। সবগুলি খোলা থাকলে, এটি পূর্ণ হতে সময় লাগে
A15 ঘণ্টা
B18 ঘণ্টা
C10 ঘণ্টা
D12 ঘণ্টা
Answer & Solution
Correct answer: A. 15 ঘণ্টা
মোট কার্যকর হার হলো প্রতি ঘণ্টায় 3/60 + 2/60 - 1/60 = 4/60 = 1/15, তাই 15 ঘণ্টা।
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