An insulated container is filled with ice at \( 0^{\circ} \mathrm{C} \), and another container i...

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An insulated container is filled with ice at \( 0^{\circ} \mathrm{C} \), and another container is filled with water that is continuously boiling at \( 100^{\circ} \mathrm{C} \). In series of experiments, the container connected by various, thick metal rods that pass through the walls of container as shown in the figure

In the experiment-I: A copper rod is used and all ice melts is 20 minutes.
In the experiment-II: A steel rod of identical dimensions is used and all ice melts in 80 minutes.
In the experiment-III: Both the rods are used in series and all ice melts in \( t_{10} \) minutes.
In the experiment-IV: Both rods are used in parallel all ice melts in \( t_{20} \) minutes.
(A) The value of \( t_{10} \) is 100 minutes
(B) The value of \( t_{10} \) is 50 minutes
(C) The value of \( t_{20} \) is 16 minutes
(D) The value of \( t_{20} \) is 8 minutes
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