With reference to Figure $1,$ what is the longitudinal distance of the payload mass centre of the vehicle from the front axle $($to the nearest mm $)?$ Vehicle parameters defined below. $($Answer in mm$,$ to nearest integer$)$

$M_1=1625kg,M_2=1100kg,l=2\mathrm{.}1m$

$a_1=0\mathrm{.}7m,$

$a_3=0\mathrm{.}942m,h_1=0\mathrm{.}9m,h_3=$

$1\mathrm{.}023m,$Static loads are not shown for clarity