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A journey of 192 km between two citie...

A journey of 192 km between two cities takes 2 hours less by a fast train than by a slow train. If the average speed of the slow train is 16 km/hr less than that of the fast train, then the average speed of the fast train is `32\ k m//h r` b. `48\ k m//h r\ ` c. `36\ k m//h r` d. `64\ k m//h r`

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