Question 1040955
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Debbie runs 10 km in 1 hour and 40 minutes. in the first half of the journey she runs at 5 km/hr. 
How fast does she travel in the second half of the journey?
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<pre>
First half of the distance is 5 km.
Second half of the distance is 5 km, too.

For the first half of the distance she spent {{{5/5}}} = 1 hour.
Hence, for the second part of the distance she spent 1 hour 40 minutes - 1 hour = 40 minutes.

Thus at the second part Debbie covered  5 km in 40 minutes = {{{2/3}}} hour.
Then she traveled the second half at the speed of {{{5/((2/3))}}} = {{{(5*3)/2}}} = 7.5 {{{km/h}}}.

<U>Answer</U>.  7.5 {{{km/h}}}.
</pre>First what you need to do to solve the problem is to read its condition attentively.