Elliptical orbit

I don't know about the concept below: I am given the mass of a star . And a planet is orbitting it. The semi major axis is of 5AU. There are 2 points on the path of orbit. Now l am told to calculate the time needing to reach from one of the point to another.

The orbital period is 10 years

Easy Math Editor

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Math	Appears as
Remember to wrap math in `\(` ... `\)` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$