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A man goes from Delhi to Dehradun. Half the distance he covers by bus at an average speed of 50 Km/hr and the other half by train at an average speed of 70 Km/hr the average speed for the whole journey was
A) 56 Km/hr
B) 64 Km/hr
C) 60 Km/hr
D) None of these
Correct answer:
D) None of these
Description for Correct answer:
v = \( \large\frac{2uv}{u + v}\) = \(\frac{2 \times 50 \times 70}{50 + 70} \)
= \( \large 58 \frac{1}{3} \) Km/hr
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