UP Police Constable Exam Model Paper 5

Distance covered in 1 round $=600\mathit{m}=600/1000=0.6\mathit{k}\mathit{m}$
$\Rightarrow$ Total distance covered in 5 rounds $=5\times 0.6=3\mathit{k}\mathit{m}$
$\because$ Time $=$ Distance/Speed
Time taken in the first round = Time taken in the fourth round $=0.6/8=0.075$ hrs.
Time taken in the second round = Time taken in the third round $=0.6/5=0.12$ hrs.
Time taken in the fifth round $=0.6/10=0.06\mathit{h}\mathit{r}\mathit{s}$.
$\Rightarrow$ Total time taken in 5 rounds $=2\left(0.075\right)+2\left(0.12\right)+0.06=0.45\mathit{h}\mathit{r}\mathit{s}.$
$\because$ Average speed $=$ Total distance travelled/Total time taken
$\therefore$ Average speed of athlete $=3/0.45=300/45=20/3\mathit{k}\mathit{m}/\mathit{h}\mathit{r}$.