Speed of the bus = (1/5) × speed of the car ⇒ Speed of the bus = (1/5) × 36 = 36/5 km/h ⇒ Distance = 900 m = 0.9 km ⇒ Time taken by bus = distance/ Speed of the bus = 0.9/(36/5) = 0.5/4 hour ⇒ Time taken by bus = (5/40) × 60 = 15/2 minutes ∴ Time taken by bus is 7