a) 15.6 kmph
b) 16.1 kmph
c) 14$${\frac{5}{7}}$$ Kmph
d) 14$${\frac{2}{7}}$$ kmph
Answer: d
Explanation:
$$\eqalign{
& {\text{Average}}\,{\text{speed}}, \cr
& = {\frac{{{\text{Total}}\,{\text{Distance}}}}{{{\text{Total}}\,{\text{time}}}}} \cr
& = {\frac{{ {200 + 300 + 500} }}{{ { {\frac{{200}}{{40}}} + {\frac{{300}}{{20}}} + {\frac{{500}}{{10}}} } }}} \cr
& = \frac{{1000}}{{70}} \cr
& = 14{\frac{2}{7}}\, \text{kmph} \cr} $$
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