300,000 km per second is the approximate speed of light.
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There's 24 hours in a standard day. Each hour has 3600 seconds in it (60 minutes, each of 60 seconds, 60 * 60 = 3600). So, that means light travels 3600 * 24 * 300 000 km in one 24-hour day, about 25920000000 km or 16105941302.792 miles.
From the information that you provided, it is not possible to determine the displacement of the car. However, I can answer your second question. The distance is: 15+10+25+10=60 km
In 6 hours @ 120 km per hour, the train travels 120*6 = 720 km. In 5 hours @ 100 km per hour, the train travels 100*5 = 500 km. So, in all the train travels 720 + 500 = 1220 km in 6 + 5 = 11 hours. Its average speed is 1220/11 =110.9090.. recurring km per hour.
1 km2 = 1 000 000 m2.
The train travels at 123.7 km/h