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Maths Puzzle
i row from a to b against the current in 8 hrs and from b to a in 2 hrs if speed of river is 9 m/sec.what is the speed of boat in still water.
Read Solution (Total 4)
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- If x m/sec is my speed in still water , then
(x+9)*2*3600= (x-9)*8*3600
6x=90
x= 15 m/sec - 11 years agoHelpfull: Yes(8) No(0)
- Speed in still water = x km/hr
speed of river = 9 m/s = 32.5 km/hr
Length from a to b = L
Against current => L = (x - 32.5)*8
towards current => L = (x + 32.5)*2
2x + 65 = 8x - 260
x = 54.1666 km/hr - 11 years agoHelpfull: Yes(0) No(3)
- (x-9)*8=(x+9)*2
8x-72=2x+18
x=15 - 11 years agoHelpfull: Yes(0) No(0)
- 15 , T=D/S so, downstream speed=D/x+9=2 and upstream=D/x-9=8 after subtracting we get 15m/s
- 1 year agoHelpfull: Yes(0) No(0)
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