alleryএকটি নল মিনিটে 25 লিটার জল প্রবেশ করায়, একটি ছিদ্র মিনিটে 5 লিটার জল বের করে দেয়। একটি 400 লিটার চৌবাচ্চা পূর্ণ হতে সময় লাগবে
A25 মিনিট
B16 মিনিট
C20 মিনিট
D80 মিনিট
Answer & Solution
Correct answer: C. 20 মিনিট
প্রকৃত জল প্রবেশের পরিমাণ মিনিটে 20 litres, সুতরাং 400/20 = 20 মিনিট।
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