How to find the focal distances of the point $P(5,4\sqrt { 3} )$ on the ellipse $16{ x }^{ 2 }+25{ y }^{ 2 }=1600$

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I have found the value of the eccentricity $e$ which is $0.6$ . How do I proceed?

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Focal points on a ellipe are (ae,0) or (-ae,0)

Here a is 100 .

From this you will get the focus . Now ypuse the distance formula to find the distance between the points .

You can try this