physics
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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The older runner must travel 10.0 km in 2,296.3 seconds. Since the younger runner can travel the same distance in 2,164.9 seconds, the younger runner must start 131.4 seconds (2,296.3 - 2,164.9 = 131.4) after the older runner in order to finish at the same time.
