alleryএখন বাইকে দুটা সমান দূৰত্বৰ পথ 40 km/h আৰু 60 km/h গতিত অতিক্ৰম কৰে। দুয়োটাৰে ক্ষেত্ৰত ইয়াৰ গড় দ্ৰুতি কিমান?
A50 km/h
B45 km/h
C48 km/h
D52 km/h
Answer & Solution
Correct answer: C. 48 km/h
সমান দূৰত্বৰ বাবে গড় হ'ল 2ab/(a+b) = 2 x 40 x 60 / 100 = 48 km/h।
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