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Maths Puzzle
a motor boat whose speed is 15km/hr in still water goes 30km downstream nd comes back in a total of 4hrs 30mins.the speed of d stream(in km/hr) is (a)4 (b)5 (c)6 (d)10
Read Solution (Total 2)
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- Let speed of stream be x
speed of boat in still water=15kmph
speed of boat for downstream=15+x
speed of boat for upstream=15-x
time=distance/speed
implies 30/(15+x)+30/(15-x)=9/2
225-x^2=200
x^2=25
x=5 - 11 years agoHelpfull: Yes(5) No(0)
- 12.54 km/hr
- 11 years agoHelpfull: Yes(0) No(2)
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