alleryএটা যাত্ৰাৰ তিনিটা সমান অংশ ক্ৰমে 20, 30 আৰু 60 km/h গতিত চলোৱা হয়। সম্পূৰ্ণ যাত্ৰাটোৰ গড় দ্ৰুতি কিমান?
A40 km/h
B35 km/h
C30 km/h
D25 km/h
Answer & Solution
Correct answer: C. 30 km/h
হৰাত্মক মধ্যক: 3 / (1/20 + 1/30 + 1/60) = 3 / (1/10) = 30 km/h।
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