A) 9 km/h
B) 16 km/h
C) 18 km/h
D) 48 km/h
Correct Answer: C
Solution :
Average speed \[=\frac{s}{\frac{s/3}{10}+\frac{s/3}{20}+\frac{s/3}{60}}=\frac{s}{s/18}=18km/h\]You need to login to perform this action.
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