**How many boxes are placed between Box A and Box B? **

Box E is placed in even numbered rack above the rack three. Box Z is placed immediately below Box E. Only three boxes are placed between Box Z and Box G. Only one box is placed between the Box G and Box D. Box F is placed immediately above Box D. Box B is not placed above Box A. Neither Box A nor Box B is placed in lowermost rack. From above statements, Box E is placed either in 4th or 6th rack (two possibilities) Remaining statements are given directly; by using we get the completed table in Case-2 Case-1 gets eliminated, as it violates the last reference point

A man can row 25/2 km an hour in still water and he finds that it takes him thrice as long to row up as to row down the river. The rate of stream is:

Speed of boat is 20 km/hr. Speed of the stream is 20% less than speed of boat. Then find time taken by boat to go 90 km downstream.

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