Write Java programs for the following

$1.$ declare integer variables hr$,$ min and sec for hours, minutes and seconds respectively. assign $3456$ to sec$.$ calculate the number of minutes and hours in $3456$ seconds.

$2.$ explain the order of arithmetic operations in java. $($This is not a coding question.$)$

$3.$ if height is $172$ cm and weight is $68$kg find the bmi

$($hint bmi $=$ weight in kg $/($height in meters$*$ height in meters$)$

$4.$ find the value of x$($y $+2/$z$)$ where x $=4,$ y $=5\mathrm{.}5$ and z $=\mathrm{.}1$