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Maths, Addmaths and Statistics: Post your doubts here!

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speed of boat a = x
speed of boat b = x + 1
distance of boat a = 1800
distance of boat b = 1500
time of boat a = 1800 / x
time of boat b = 1500 / x+1
difference in time = i minute = 60 seconds
so we get the euation : (1800 / x) - ( 1500 / x+ 1) = 60
then simplify it
 
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In part d how do we know y=x ki line draw karni hai? :/
12/x -x =y
when two line intersect ...their coordinates are same
so the equations of the two lines beome equal..
for the equation 12/x=2x to become 12/x -x=y we could minus x on boths sides of the second equation..
this way we would get 12/x-x=x
and hencce we will get y=x
 
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