We know that there are 24 hrs in a day, 60 min in a hr, and 60 sec in an min. Putting all this together, we get:
86,400 sec in a day.
No we can solve your question.
d = v*t
d = 7500cm/sec * 86,400sec
d = 648,000,000 cm/sec
To convert cm to km, we know that:
1cm = 1/100m and
1m = 1/1000km
So, we multiply these two fractions to get
1cm = 1/100000km
Finally, we multiply this conversion factor by our answer to get our answer in km.
648,000,000/100,000 = 6480km in one day.
When we multiply v (which is in cm/sec) by t (which is in sec) we are left with the unit of cm.
Hopefully this makes sense.