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Physics
Problem
A car travels
120
km
120\,\text{km}
120
km
in
2
h
2\,\text{h}
2
h
along a straight road, then turns back and covers
60
km
60\,\text{km}
60
km
in
1
h
1\,\text{h}
1
h
along the same road. What is the average speed for the whole journey? a)
70
km/h
70\,\text{km/h}
70
km/h
b)
45
km/h
45\,\text{km/h}
45
km/h
c)
60
km/h
60\,\text{km/h}
60
km/h
d)
90
km/h
90\,\text{km/h}
90
km/h
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