Frank L. H. Wolfs
Department of Physics and Astronomy, University of Rochester, Slide 38
Consequences of Einstein's special theory of relativity: Time dilation.
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¥ Observer 1 measures the time interval between the ticks of the clock.  Her observations are summarized in the following table.
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¥V      Dt1
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¥0 km/s 1 sec
¥10 km/sec 1 sec
¥1000 km/sec 1.000006 sec
¥100000 km/sec  1.061 sec
¥200000 km/sec 1.34 sec
¥290000 km/sec  3.94 sec
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¥Note: 10 km/s = 22,500 mi/h
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V
Clock
Dt2 = 1 sec between ticks