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Delhi metro covers a distance in 40 min,...

Delhi metro covers a distance in 40 min, if it runs at a speed of `48 km//h` on an average. Find the speed at which the train must run to reduce the time of journey to 32 min.

A

`60 km//h`

B

`50 km//h`

C

`70 km//h`

D

`80 km//h`

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