A bus and a Lamborghini started travelling from Town C to Town D at the same time. After 4 hours, the Lamborghini reached Town D while the bus covered only ⁷₉ of the journey. The speed of the bus was 16 km/h less than the speed of the Lamborghini. Find the speed of the Lamborghini.
Extra distance covered by the Lamborghini in 4 h
= 4 x 16
= 64 km

When the Lamborghini reached Town D:
Distance covered by the Lamborghini = 9 u
Distance covered by the bus = 7 u

Extra distance covered by the Lamborghini 
= 9 u - 7 u
= 2 u

2 u = 64

1 u = 64 ÷ 2 = 32

Distance covered by the Lamborghini when it reached Town D
= 9 u
= 9 x 32
= 288 km

Speed of the Lamborghini
= 288 ÷ 4
= 72 km/h

Answer(s): 72 km/h