In a rare of 100 m, A beats B by 100 or 10 seconds :
In a rare of 100 m, A beats B by 100 or 10 seconds. If they starts a race of 1000 m simultaneously from the same point and if B gets injured after running 50 m less than half the rave length and due to which his speed gets halves, then by how much time will A beat B?
(a) 65 seconds
(b) 60 seconds
(c) 50 seconds
(d) 45 seconds