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
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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?
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
