A) 10 km/hr
B) 25 km/hr
C) 20 km/hr
D) 30 km/hr
Correct Answer: C
Solution :
Time taken \[=\frac{3}{10}+\frac{3}{20}+\frac{3}{30}+\frac{3}{60}\] \[=\frac{3}{5}hours\] Now, average speed \[=\frac{3+3+3+3}{3/5}\] \[=\frac{12\times 5}{3}km/hr\] \[=20\,km/hr\]You need to login to perform this action.
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