SOLUTION: An 18-year-old runner can complete a 10.0-km course with an average speed of 4.63 m/s. A 50-year-old runner can cover the same distance with an average speed of 3.82 m/s. How much

Question 309693: An 18-year-old runner can complete a 10.0-km course with an average speed of 4.63 m/s. A 50-year-old runner can cover the same distance with an average speed of 3.82 m/s. How much later (in seconds) should the younger runner start in order to finish the course at the same time as the older runner?

Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
18 year old runner distance 10 km - speed = 4.63 m/sec.
50 year old runner distance 10 km -3.82 m /sec
The distance is in km and speed in m/sec.
convert distance to meters
10km = 10,000 meters.
time taken by 18 year old = 10000/4.63
= 2159.82 seconds
.
time taken by 50 year old = 10000/3.82
= 2617.80 seconds
457.98 seconds
He can start 458 seconds later to reach at the same time
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