A right circular cone with radius \( R \) and height \( H \) contains a liquid which evaporates ...

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A right circular cone with radius \( R \) and height \( H \) contains a liquid which evaporates at a rate proportional to its surface area in contact with air (proportionality constant \( =k0 \) ). Suppose that \( r(t) \) is the radius of liquid cone at time \( t \).
The radius of water cone at \( t=1 \) is
(a) \( R[1-k / H] \)
(b) \( R[1-H / k] \)
(c) \( R[1+H / \mathrm{k}] \)
(d) \( R[1=k / H] \)
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