A lorry and a Lamborghini started travelling from Town E to Town F at the same time. After 2 hours, the Lamborghini reached Town F while the lorry covered only ⁵₇ of the journey. The speed of the Lamborghini was 30 km/h more than the speed of the lorry. Find the speed of the lorry.
Extra distance covered by the Lamborghini in 2 h
= 2 x 30
= 60 km

When the Lamborghini reached Town F:
Distance covered by the Lamborghini = 7 u
Distance covered by the lorry = 5 u

Extra distance covered by the Lamborghini 
= 7 u - 5 u
= 2 u

2 u = 60

1 u = 60 ÷ 2 = 30

Distance covered by the lorry when the Lamborghini reached Town F
= 5 u
= 5 x 30
= 150 km

Speed of the lorry
= 150 ÷ 2
= 75 km/h

Answer(s): 75 km/h