Răspuns:
1.
a) 60 km
b) 50'
c) 60000 min/ 50×60 sec =7200 m/sec=72 km/h
2.
v=4m/s
la ora 14 -borna km 50
? ora -borna km 75
rezolvare: 4m/s=25000/?
?=6250 s=1h si 42 min
a ajuns la ora 15:42
3.
borna km 20 - ora 10h20'(t1)
deltaT=0.2h
borna km 28
a) 0.2×60 =12 min=720 sec
t2=10h32'
b) d=28-20=8 km =8000 m
(viteza medie)=vm= 8000 m/720 sec=11 m/s
