Answer: 500 seconds
This is equivalent to the following
- 8.33333 minutes (approximate)
- 8 minutes, 20 seconds
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Work Shown
distance = 1.5 * 10^8 km
speed = 3 * 10^8 m per sec = 3 * 10^5 km per sec
To go from "meters per second" to "kilometers per second", we divide by 1000, aka 10^3. This would mean the 10^8 becomes (10^8)/(10^3) = 10^(8-3) = 10^5. It's very important that we convert from meters to kilometers so the units match up.
Then we would say:
time = distance/speed
time = (1.5 * 10^8 km) / (3 * 10^5 km per sec)
time = (1.5/3) * (10^8)/(10^5) seconds
time = 0.5 * 10^(8-5) seconds
time = 0.5*10^3 seconds
time = 500 seconds
Let's convert from seconds to minutes.
500 seconds = (500 sec)*( (1 min)/(60 sec) )
500 seconds = 500/60
500 seconds = 8.333 minutes approximately
Or we could have this conversion
500 seconds = 500/60 = 8 remainder 20 = 8 minutes, 20 seconds