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Maths Puzzle
Logical Reasoning
Cryptography
A bicycle rider went a mile in three minutes with the wind, and returned in four minutes against the wind. How fast could he ride a mile if there was no wind?
Read Solution (Total 3)
-
- let cycle speed only= x,
wind speed only=y
same directn speed= x+y
opp. directn speed= x-y
he travelled 1 mile.
so 1/(x+y)=3
&
1/(x-y)=5
s0 x comes out to be= 8/30 mile/min.
so he take 30/8= 3.75 min when no wind is there. - 12 years agoHelpfull: Yes(0) No(2)
- let speed with wind be a=3
speed against wind be b=4
speed=1/2(a+b)
i.e 3.5 is the ans - 10 years agoHelpfull: Yes(0) No(0)
- let the rider move at "u"miles per minute and let the wind blow at "v"miles per minute .
velocity of bicycle rider with the wind is "u+v"=1/3 miles/mminute
velocity of bicycle rider against the wind is "u-v"=1/4 miles/minute
solving the two equations
u+v=1/3
u-v=1/4
we get u=7/24
i.e speed of rider when there is no wind is [7/24]miles/minute
therefore he could ride a mile in 17.5 seconds i.e [7/24]miles/minute - 9 years agoHelpfull: Yes(0) No(0)
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