A man goes downstream with a boat to some destination and returns upstream to his original place in 5 hours. If the speed of the boat in still water and the stream are 10 km/hr and 4 km/hr respectively, the distance of the destination from the starting place is

(A) 21 km

(B) 25 km

(C) 16 km

(D) 18 km

Ans.(a)

 

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