SOLUTION: Debbie runs 10km in 1 hour and 40 minutes. in the first half of the journey she runs at 5km/hr. how fast does she travel in the second half of the journey? please explain thouro

Question 1040955: Debbie runs 10km in 1 hour and 40 minutes. in the first half of the journey she runs at 5km/hr. how fast does she travel in the second half of the journey?
please explain thouroughly, and before sunday if you can!! thank you.
Answer by ikleyn(52810) (Show Source): You can put this solution on YOUR website!
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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?
~~~~~~~~~~~~~~~~~~~~~

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  = 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 =  hour.
Then she traveled the second half at the speed of  =  = 7.5 .

Answer.  7.5 .

First what you need to do to solve the problem is to read its condition attentively.

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