allery150 m দীঘল এখন ৰে'ল 54 km per hour গতিত চলে। এটা খুঁটি পাৰ হ'বলৈ ইয়াৰ লগা সময় হ'ল:
A10 seconds
B8 seconds
C12 seconds
D15 seconds
Answer & Solution
Correct answer: A. 10 seconds
1. এটা খুঁটি পাৰ হ'বলৈ ৰে'লখনে নিজৰ দৈৰ্ঘ্য, 150 m অতিক্ৰম কৰিব লাগিব।
2. 5/18-ৰে গুণ কৰি দ্ৰুতিক metres per second-লৈ ৰূপান্তৰ কৰক।
3. 54 x 5 / 18 = 15 metres per second।
4. সময় হ'ল 150 / 15 = 10 seconds।
5. ৰূপান্তৰ পাহৰি গৈ 150 ক 54-ৰে ভাগ কৰিলে প্ৰায় 2.8 seconds পোৱা যাব, যিটো সাধাৰণতে হোৱা ভুল।
_Source: syllabus Maths, Ch 11 'Direct and Inverse Proportions', S11.3 Inverse Proportion_
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