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The use of "most" with the superlative adjective "happiest" is incorrect. The correct form is simply "the happiest person," as "happiest" already denotes the superlative, and "most" is unnecessary.
How much time a train 200 metres long running at the speed of 72 km/hr take to cross a bridge 180 metres in length?
A man travels some distance at a speed of 32 km/hr and returns at a speed of 24 km/hr. If the total time taken by him is 2 hrs 20 min, the distance is