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Due to the technical snag in the signal system two trains starts approaching each other on the same rail track from two different stations 240km away from each other . When the train starts a birds also starts moving to end fro between the two two trains at 60km/h touching each time each train. the bird is initially sitting on the top of the engine of one of the trains and it moves so till these trains collide If these trains collide one and a half hour after the starts then how many kilometers bird travells till the time of collision of trains?

A

90 km

B

130 km

C

120 km

D

none of these

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The correct Answer is:
A
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