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= 50 / 36 m/s
= 25 / 18 m/s
= 1,39 m/s
= 5 km × 1000 = 5000 m
--------- ---------
jam × 3600 s
= 5000 m
---------
3600 s
= 50 m
----
36 s
= 25/18 m/s