no.18 caranya gimana ya,,tolong di bantu ya.please

jawabannya 270
v1=75
t1 =2.25 jam
s1 = v x t
     = 101.25 km

v2 = 45
t2  = 2.25 jam
s2  = v x t
      = 101.25

Stotal = S1 + S2
          = 207 km