Find the forward distance moved by the bird ?

Question

A thief starts running along a straight line with 40km/hr at 9 am . The police start chasing him at 10 am with speed 60 km/hr . Also a bird started chasing the thief at 10 am with same initial point as that of police with speed 100 km/hr and as soon as it reaches the thief the bird comes back to the point where she meets police and the bird continues this too and fro motion.Find the forward distance moved by the bird ?

Answer 1

The thief has a 40 km head start. It will take the police 2 hours to make up that distance. The bird will have flown 200 km during that time. Not sure what you mean with forward distance. If total distance = 200 km. If distance between start point and catching thief = 120 km. If only the distance when flying towards the thief = 160 km (distance to catch the thief + half the remaining distance the bird flew).