alleryएक बाइक दो बराबर दूरियों को क्रमशः 40 किमी/घंटा और 60 किमी/घंटा की चाल से तय करती है। दोनों दूरियों के दौरान इसकी औसत चाल क्या है?
A50 किमी/घंटा
B45 किमी/घंटा
C48 किमी/घंटा
D52 किमी/घंटा
Answer & Solution
Correct answer: C. 48 किमी/घंटा
समान दूरियों के लिए औसत चाल = 2ab/(a+b) = 2 x 40 x 60 / 100 = 48 किमी/घंटा है।
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