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A man can row 30 km downstream in 2 hours and 15 km upstream in 5 hours. Find the man's rowing rate in still water
option
(a) 7.5 kmph
(b) 8 kmph
(c) 8.5 kmph
(d) 9 kmph
(e) None of these
Read Solution (Total 4)
-
- Speed while going downstream=(30/2)=15 km/hr
Speed while going upstream=(15/5)=3 km/hr
Let speed of man in still water be a km/hr.
Let speed of water be x km/hr.
So while downstream a+x=15.
while upstream a-x=3.
Solving the two equations, speed of man = 9 kmph - 10 years agoHelpfull: Yes(8) No(0)
- upstream=15km/hr
downstream=3km/hr
still water speed=15+3/2
9 km/hr - 10 years agoHelpfull: Yes(4) No(0)
- trick :-
speed of man= (upstream+downstream)/2
(30/2+15/5)/2
(15+3)/2
18/2=9kmph - 10 years agoHelpfull: Yes(1) No(0)
- 9 kmph
DOWN UP BOT STREAM
s 15 3 9 6
t 2 5
d 30 15 - 10 years agoHelpfull: Yes(0) No(0)
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