Light can travel 7.5 times around the globe in a second.
One year is 365 days. 365 times 24, which is 8760 hours.
8760 hours times 60, which is 525600 minutes.
525600 minutes times 60, which is 31536000 seconds.
So One light year can travel 40000 km times 7.5 times 31536000,
which is 126144 times 7.5 times 10000000, which is 946080 times 10000000, which is 9,460,800,000,000 km.
Answer. about 9.4 trillion km (9.4 cho km)
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