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एक मनीस अर्दो प्रवास $40$ किमी/तास आनी दुसरो अर्दो $60$ किमी. पुराय प्रवासाची ताची सरासरी गती सोदून काडात.

A$45$ km/hr
B$48$ km/hr
C$50$ km/hr
D$52$ km/hr
Answer & Solution
Correct answer: B. $48$ km/hr
समान अंतराखातीर सरासरी गती म्हळ्यार सुवातीचें सरासरी: $\dfrac{2xy}{x+y} = \dfrac{2 \times 40 \times 60}{100} = \dfrac{4800}{100} = 48$ किमी/तास. पर्याय C ($50$, अंकगणितीय सरासरी) फकत *वेळ* सारको विभागला तेन्नाच लागू जाता, अंतर न्हय.
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