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Q.
A man goes down stream 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 strean are 10km/hr and 14km/hr respectively, the distance of the destination from the string place is
A.
16 km
B.
18 km
C.
21 km
D.
25 km
View Answer
Correct choice: C
Explanation:
Let the distance covered be D km. D10+4+ D10−4 = 5 D14+D6=5 10D = 42 x 5 = 210 => D = 21 km
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