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Physics
Problem
A car travels
60
km
60\,\text{km}
60
km
at
30
km/h
30\,\text{km/h}
30
km/h
along a straight road and then another
60
km
60\,\text{km}
60
km
in the same direction at
60
km/h
60\,\text{km/h}
60
km/h
. Calculate its average speed for the whole journey. a)
50
km/h
50\,\text{km/h}
50
km/h
b)
45
km/h
45\,\text{km/h}
45
km/h
c)
40
km/h
40\,\text{km/h}
40
km/h
d)
30
km/h
30\,\text{km/h}
30
km/h
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