alleryএকটি পাম্প একটি চৌবাচ্চা 5 ঘণ্টায় পূর্ণ করে, কিন্তু একটি ছিদ্র থাকার কারণে 6 ঘণ্টা সময় লাগে। একা ছিদ্রটি এটি খালি করবে
A30 ঘণ্টা
B11 ঘণ্টা
C25 ঘণ্টা
D20 ঘণ্টা
Answer & Solution
Correct answer: A. 30 ঘণ্টা
ছিদ্রের হার হল প্রতি ঘণ্টায় 1/5 - 1/6 = 1/30, সুতরাং খালি হতে 30 ঘণ্টা সময় লাগবে।
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