Posted by **Natasha** on Friday, January 20, 2012 at 12:53pm.

An 18-year-old runner can complete a 10.0 km course with an average speed of 4.58 m/s. A 50-year-old runner can cover the same distance with an average speed of 4.36 m/s. How much later (in seconds) should the younger runner start in order to finish the the course at the same time as the older runner?

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**Steve**, Friday, January 20, 2012 at 2:09pm
ytime = 10km * 1000m/km / 4.8m/s = 2083.3 sec

otime = 10km * 1000m/km / 4.36m/s = 2293.6 sec

difference = 210.3 sec

the youngster can loll around for about 3.5 minutes before taking off.

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**Meme**, Sunday, September 27, 2015 at 5:11pm
a child traveling 5 m/s on a sleed passes her younger brother. if her average acceleratrion in the sledding hill id 2m/s, how fast is the traveling when she passews her oldeer brother 4s later

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