Given:
Fare of a taxi journey is given by 
 , c= cost per kilometre, m= number of kilometres travelled.
, c= cost per kilometre, m= number of kilometres travelled.
c=40p, m=8km.
To find:
The fare charged.
Solution:
Fare of a taxi journey is given by
 ...(i)
 ...(i)
where,
c= cost per kilometre
m= number of kilometres travelled.
Putting c=40 and m=8 in (i), we get
 
 

Therefore, the fare of a taxi journey is 320 p.