Answer:
97 minutes and 12 seconds
Explanation:
Let x be the total time
From the first statement
[tex]\frac{10}{100}x=24\times 60+18\\\Rightarrow 0.1x=1458\\\Rightarrow x=\frac{1458}{0.1}\\\Rightarrow x=14580\ seconds[/tex]
Total time of Dara's exercise is 14580 seconds
40 %
[tex]\frac{40}{100}\times 14580=5832\ seconds[/tex]
[tex]\frac{5830}{60}=97.2\ minutes=97+0.2\times 60\\ =97\ minutes\ and\ 12\ seconds=1\ hour\ 37\ minutes\ and\ 12\ seconds[/tex]
Time when she had completed 40% was 1 hour 37 minutes and 12 seconds
