Let the speed of the car be S

Then speed of truck is: S - 20

Time taken by car to travel 480 km: 

Time taken by truck to travel 480 km: 

Since the car takes 2 hours less than the truck, to travel 480 km, we can say that: 

480(S - 20) + 2(S)(S - 20) = 480(S) ------- Multiplying by LCD, S(S - 20)











(S - 80)(S + 60) = 0

S = 80                         OR                         S = - 60 (ignore)

S, or speed of car =  km/h 

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