alleryএকটি যাত্রার তিনটি সমান অংশ 20, 30 এবং 60 km/h গতিবেগে অতিক্রম করা হয়। সম্পূর্ণ যাত্রার গড় গতিবেগ কত?
A40 km/h
B35 km/h
C30 km/h
D25 km/h
Answer & Solution
Correct answer: C. 30 km/h
বিপরীত গড় (Harmonic mean): 3 / (1/20 + 1/30 + 1/60) = 3 / (1/10) = 30 km/h।
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