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Physics
Problem
A bus travels three successive stretches of a trip as follows: (i)
30
km
30\,\text{km}
30
km
at
40
km/h
40\,\text{km/h}
40
km/h
, (ii)
20
km
20\,\text{km}
20
km
at
30
km/h
30\,\text{km/h}
30
km/h
, and (iii)
50
km
50\,\text{km}
50
km
at
50
km/h
50\,\text{km/h}
50
km/h
. Calculate the average speed of the bus for the whole
100
km
100\,\text{km}
100
km
journey.
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