A) 10 min
B) 2 min
C) 20 min
D) 8 min
Correct Answer: B
Solution :
[b] \[\frac{-({{T}_{2}}-{{T}_{1}})}{\Delta {{t}_{1}}}=\frac{k'}{{{m}_{1}}{{s}_{1}}}\left[ \frac{{{T}_{1}}+{{T}_{2}}}{2}-{{T}_{s}} \right]\] \[\frac{-({{T}_{2}}-{{T}_{1}})}{\Delta {{t}_{2}}}=\frac{k'}{{{m}_{2}}{{s}_{2}}}\left[ \frac{{{T}_{1}}+{{T}_{2}}}{2}-{{T}_{s}} \right]\] \[\frac{\Delta {{t}_{2}}}{\Delta {{t}_{1}}}=\frac{{{m}_{2}}{{s}_{2}}}{{{m}_{1}}{{s}_{1}}}\] \[\frac{\Delta {{t}_{2}}}{5}=\left( \frac{800}{1000} \right)\times \left( \frac{1}{2} \right)=\frac{1}{2.5}\] \[\Delta {{t}_{2}}=2\] minute
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