Class 10 Book Solution from K C Nag in Variation Question No: 7.4.3(xvii)(b)
ইঞ্জিনের কয়লা খরচ \(\propto\) \(\Big(\)গতিবেগ\(\Big)^2\); যখন ইঞ্জিনের গতিবেগ ঘন্টায় 50 কিমি তখন ঘন্টায় খরচ 100 কিলোগ্রাম। প্রতি কিলোগ্রাম কয়লার মূল্য 25 পয়সা হলে এবং প্রতি ঘন্টায় ইঞ্জিন চালাবার অন্যান্য খরচ 4 টাকা হলে ওই ইঞ্জিনের 300 কিমি যেতে নূন্যপক্ষে কত ব্যয় হবে ?
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