tlng no 34 bsk mau dikumpul

s total = 240 km = 240.000 m
t total = 3 jam 30 menit = 3,5 jam = 210 menit = 12.600 detik

Kelajuan rata - rata
v = s/t total
v = 240/3,5 = 68.5 km/jam

v = 240.000/12.600 = 19 m/s