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A train travels 180 km at a uniform spee...

A train travels 180 km at a uniform speed. If the speed had been 9 km/hour more, it would have taken 1 hour less for the same journey. Find the speed of the train.

A

20 m/s

B

`10sqrt2 m/s`

C

40 `m/s`

D

`20sqrt2 m/s`

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