SOLUTION: Hi, Can anyone help with this? I believe I have to divide but am not positive: If a spacecraft is traveling 3x10(20) miles per hour, how long does it take the spacecraft to tr

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Hi, Can anyone help with this? I believe I have to divide but am not positive: If a spacecraft is traveling 3x10(20) miles per hour, how long does it take the spacecraft to tr      Log On


   

Question 21799: Hi,
Can anyone help with this? I believe I have to divide but am not positive:
If a spacecraft is traveling 3x10(20) miles per hour, how long does it take the spacecraft to travel 9.3x10(23) miles? Express answer in Scientific Notation.
Please note that the (20) and (23) are exponents.
Thanks for your help!!
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
When you are not sure of whether or not you have to divide, do a little dimensional analysis on the problem.
Your answer will be in number of hours.
The distance is in miles.
The speed is in miles/hour.
So, if you try: miles divided by miles/hour and simplify this you'll get hours because the miles will cancel.
You need to divide the distance (miles) by the speed (miles/hour) to get the time of travel(hours).
%289.3X10%5E23%29%2F%283X10%5E20%29+=+3.1X10%5E3 hours.