An 18 year old runner can complete a 10....

An 18 year old runner can complete a 10.0 km course with an average speed of 4.39 m/s. A 50 year old runner can cover the same distance with an average speed of 4.27 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 ?

12 s

48 s

64 s

24 s

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