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In a 1 km race A gives B a startup of 5...

In a 1 km race A gives B a startup of 5 second and still wins over B by 15 seconds. The ratio of speed of A and B is 2:1 Find the time taken by A to finish 2.5 km race.

A

a. 40 sec

B

b. 50sec

C

c. 30 sec

D

d. 60 sec

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