A fast train takes 3 hours less than the slow train for a journey of 600km. IF

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A fast train takes 3 hours less than the slow train for a journey of 600km. IF the speed of the slow train is 10km/hr less than the fast train the speed of the slow train is

Options:

A . 30km/hr

B . 35km/hr

C . 40km/hr

D . 45km/hr

Answer: Option C

let the speed of the train be x km/hr and (x + 10)km/hr, then

=> x² + 10x -2000 =0
=> (x +50)(x +40) = 0
=> x =40
Speed of a slow train = 40km/hr

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