How to convert decimal value into total seconds

I have a formula that reads like this

=((11.4)-0.000000000946727*(11.4)*((5000)*5000))

The formula is used to calculate a comparative run time at an elevation of 5000 feet. The time the run was in is 11 minutes and 40 seconds. What I need to do is convert the 11.40 into total seconds which would be 700.

Now the actual 11.4 in the forumala is from a cell reference (say D14). It's whatever time the member plugs in (and so is the 5000, this represents the members altitude). I need the time to stay in a decimal format because I have a huge database that I perform a lookup on to find the point value for it for another calculation seperate from this one. If I were to plug 700 in place of 11.4 my calculated result would be 683.43 which is exactly what I need.

Summary, how can I convert a decimal such as 11.4 to total seconds, in this case it would be 700? Any help would be appreciated!

Thanks in advance!

Few routes:

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the latter requires activation of Analysis ToolPak Add-In in versions prior to XL2007

Thanks, however, If you lurk here as much as I do you'd find it's actually pretty difficult not to benefit from everyone else's expertise ... I would say that it is the board itself that is genius ... as individuals we all benefit from it.