A bus and a Lamborghini started travelling from Town R to Town S at the same time. After 2 hours, the Lamborghini reached Town S while the bus covered only ⁵₇ of the journey. The speed of the bus was 28 km/h less than the speed of the Lamborghini. Find the speed of the Lamborghini.
Extra distance covered by the Lamborghini in 2 h
= 2 x 28
= 56 km

When the Lamborghini reached Town S:
Distance covered by the Lamborghini = 7 u
Distance covered by the bus = 5 u

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

2 u = 56

1 u = 56 ÷ 2 = 28

Distance covered by the Lamborghini when it reached Town S
= 7 u
= 7 x 28
= 196 km

Speed of the Lamborghini
= 196 ÷ 2
= 98 km/h

Answer(s): 98 km/h