Answer:
\[Average\,speed=\frac{total\,\,dis\tan ce}{total\,\,time}\]
\[=\frac{4\times 100}{\frac{100}{400}+\frac{100}{500}+\frac{100}{600}+\frac{100}{700}}\]
\[=526.32\,\,km/h\]
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