The driver of a car sees a bus 25 m ahead of him, After 16s, the bus is 55 m behind. If the speed of the car is 30 km/hr, what is the speed of the bus? Neglect the lengths of car and the bus
1). 16 km/hr
2). 22 km/hr
3). 24 km/hr
4). 12 km/hr
Total distance travelled by car in 16s = 25 + 55 = 80 m
Let the speed of the bus be ‘a’ km/hr
Relative speed of car w.r.t. bus = 30 – a km/hr
Speed = distance/time
⇒ Relative speed of car w.r.t. bus = 80/16 = 5 m/s = 18 km/hr
Thus, 30 – a = 18
∴ a = 12 km/hr