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## Homework Statement

Pluto is 40 times further from the Sun than we are. How long is a year on Pluto? (Use Kepler's third law.)

## Homework Equations

4∏^2/Gm=T^2/r^3

## The Attempt at a Solution

Te^2(Earth period)=x*r^3

Tp^2(Pluto period)=x*(40r)^3

I don't know what to do exactly from here. I'm not even entirely sure that I'm going about this the right way.

Any help would be appreciated.