Question 1203916
<font color=black size=3>
Answer: 2.75 hours (exact)


Work Shown
{{{
matrix(1,2,9900,"sec")
=
(matrix(1,2,9900,"sec"))
(matrix(1,2,1,"min")/matrix(1,2,60,"sec"))
(matrix(1,2,1,"hr")/matrix(1,2,60,"min"))
=
matrix(1,2,2.75,"hr")
}}}
The units "sec" and "min" cancel out based on how the conversion fractions are set up.


Or a slight shortcut
{{{
matrix(1,2,9900,"sec")
=
(matrix(1,2,9900,"sec"))
(matrix(1,2,1,"hr")/matrix(1,2,3600,"sec"))
=
matrix(1,2,2.75,"hr")
}}}
The shortcut works because 1 min = 60 sec and 1 hr = 60 min, so 1 hr = 60*60 = 3600 sec
</font>