1117km/h = 1117 x 1000 ÷ 3600 m/s ~= 310m/s
Depending upon the medium sound can travel at about this speed; for example the speed of sound in air can vary between 295m/s and 340m/s depending upon altitude.
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40km per hour
In 1 hour it travels 60 km Hence In 6 hours it travels 6 x 60 = 360 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.
Speed is NOT measured in km but km PER HOUR. The average speed was 88.88 (repeating) km per hour.
Speed of light * * * * * Nothing, since the speed of light in vacuum is around 1080 million km/h. In any case, the "speed of light" does not travel!