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An object is fired up a frictionless ramp 65 degrees to the horizontal with an initial velocity of 35 m/s, how long does the object take to return to the starting point.

What I did was:

cos 23 * 35m/s = Vyo

Vyo = 31.72 m/s

Vf = Vo + at

0 m/s = 31/72 m/s + (9.8m/s^2)(t)

t = 3.24s

Then doubled time for down to equal: 6.5s

The answer in the key is 7.9s.

What did I do wrong here?

Thanks,