[modymyth]

Ana 3andy tany bs taweeeeeel w beyafakarny bel-maths :
, v = 320 m/s , x =800 m
t1 = 2d1/v
t2 = 2d2/v
da b fard en d1 as8ar mn d2
t2-t1=1 Sec
2d2/320 - 2d1 / 320 = 1 sec
2 (d2-d1)/ 320= 1
ww .......... d1 + d2 = 800 ...... ya3ny ........... d2 = 800 - d1
ya3ny ............. 2 ( 800 - 2d1) / 320 = 1 sec
1600 - 4d1 = 320
4d1 = 1600 -320 = 1280
d1 ( nearer ) = 320