There are 100 runners entered in a marathon. How many different groups of three runners can finish in first, second, and third?
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You know that 1 km=1000 m, then the length of the road km is
metres.
A group of 8 people are picking up litter along the road and each person is assigned an equal section of the road. The whole road has length 800 m, then for each person will be assigned 800:8=100 m of the road.
If you want to know the length of each part in km, then 1 m=0.001 km and 100 m =1 m·100=0.001 km ·100=0.1 km.
The area of 
is given by the integral
Integrating yields
So you have
Integrating yields
So you have