A) \[\frac{30+25+50}{3}\]km/hr
B) \[{{(30,\,25,\,50)}^{\frac{1}{3}}}\]
C) \[\frac{3}{\frac{1}{30}+\frac{1}{25}+\frac{1}{50}}\]km/hr
D) None of these
Correct Answer: C
Solution :
Average speed \[=\]\[\frac{120+120+120}{\frac{120}{30}+\frac{120}{25}+\frac{120}{50}}\] \[=\frac{3}{\frac{1}{30}+\frac{1}{25}+\frac{1}{50}}km/hr\].You need to login to perform this action.
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