A van and a Lamborghini started travelling from Town A to Town B at the same time. After 6 hours, the Lamborghini reached Town B while the van covered only ⁵₇ of the journey. The speed of the van was 30 km/h less than the speed of the Lamborghini. Find the speed of the Lamborghini.
Extra distance covered by the Lamborghini in 6 h
= 6 x 30
= 180 km

When the Lamborghini reached Town B:
Distance covered by the Lamborghini = 7 u
Distance covered by the van = 5 u

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

2 u = 180

1 u = 180 ÷ 2 = 90

Distance covered by the Lamborghini when it reached Town B
= 7 u
= 7 x 90
= 630 km

Speed of the Lamborghini
= 630 ÷ 6
= 105 km/h

Answer(s): 105 km/h