A) 70kmph
B) 76kmph
C) 69.2 kmph
D) 67.2 kmph
Correct Answer: D
Solution :
[d] Required average speed \[=\left( \frac{2xy}{x+y} \right)\] km.p.h. \[=\frac{2\times 84\times 56}{(84+56)}\] km.p.h = 67.2 km.p.h.You need to login to perform this action.
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