allery200 m দীঘল এখন ৰে'লগাড়ীয়ে 36 km per hour গতিত 100 m প্লেটফৰ্ম এখন অতিক্ৰম কৰে। ইয়াৰ সময় লাগে:
A20 seconds
B25 seconds
C30 seconds
D36 seconds
Answer & Solution
Correct answer: C. 30 seconds
1. এখন প্লেটফৰ্ম অতিক্ৰম কৰিবলৈ ৰে'লখনে নিজৰ দৈৰ্ঘ্যৰ লগতে প্লেটফৰ্মখনৰ দৈৰ্ঘ্যও অতিক্ৰম কৰিব লাগিব।
2. সেই মুঠ দৈৰ্ঘ্য হ'ল 200 + 100 = 300 m।
3. দ্ৰুতি ৰূপান্তৰ কৰক: 36 x 5 / 18 = 10 metres per second।
4. সময় হ'ল 300 / 10 = 30 seconds।
5. কেৱল ৰে'লখনৰ দৈৰ্ঘ্য ব্যৱহাৰ কৰিলে 20 seconds পোৱা যাব, যিটো ইয়াত বিভ্ৰান্তিকাৰী উত্তৰ।
_উৎস: পাঠ্যক্ৰম Maths, অধ্যায় 11 'Direct and Inverse Proportions', S11.3 Inverse Proportion_
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