Many scientists allege that the speed of light is a constant, usually represented by the letter "c", which has a value of 299,792,458 meters per second.
What you need is to first convert that value to kilometers per hour. Since there is 1 kilometer per 1000 meters, and 60 seconds per minute, and 60 minutes per hour, you can multiply this all together, as follows:
299,792,458 m/s * (1/1,000) km/m * 60 s/min * 60 min/hr
The units cancel, and you're left with ((299,792,458*60*60)/1,000) km/hr, or 1,079,252,848.8 km/hr, which is the alleged speed of light in kilometers per hour.
From there, you simply multiply 1,079,252,848.8 km/hr by (2.0*(10^1)) hr, and the units cancel, and you're left with 21,585,056,976 km, and that number is the answer.
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