A car can cover a distance of 18 km in 24 minutes. ⇒ Speed of the car = 18/(24/60) = 45 km/h ⇒ The speed of a bus = 2 × Speed of the car ⇒ The speed of a bus = 2 × 45 = 90 km/h ⇒ Time taken by bus = 135/90 = 3/2 hours = 90 minutes ∴ The bus covers a distance of 135 km in 90 minutes.