Question

A driver of an auto rickshaw sees a city bus 45 meters ahead of him. After 24 seconds the city bus is 75 meters behind. If the speed of the auto rickshaw is 43 km/h, then what is the speed of the city bus?

1. 20 km/h
2. 18 km/h
3. 23 km/h
4. 25 km/h

Answer 1

Correct Answer - Option 4 : 25 km/h

Let S and R be the speed of city bus and relative speed of auto rickshaw with respect to city bus.

According to question, R = (45 + 75)/24 m/s = 120/24 m/s = 5 m/s = 5 × (18/5) km/h = 18 km/h

Also, R = 43 – S ⇒ S = 43 – 18 = 25 km/h