Posted by **Amber** on Tuesday, December 14, 2010 at 3:33pm.

A space probe is 7.62 x 10 to the 7th power kilometers from the surface of the planet Mars. If the space probe is traveling towards mars at a arate of 127 meters per second, how many hours will it take the probe to reach the surface of the plant? Round to the nearest hour.

Help!? I don't understand what to do to understand how many hours!

- 7th grade Math -
**Henry**, Wednesday, December 15, 2010 at 3:03pm
127 m/s / 1000 = 0.127 km/s.

d = r*t = 7.62*10^7 km,

0.127t = 7.62*10^7,

t = 7.62*10^7 / 0.127 = 60*10^7 s.

t = 60*10^7 5. / 3600 s/h = 167000 h.

- 7th grade Math -
**Amber**, Wednesday, December 15, 2010 at 4:46pm
Thank you so much! I didn't understand it at all!

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