Physics - Heat & Thermo Question with Solution | TestHub

Let $\mathrm{t}$ be the time taken, then $$\begin{array}{rl}& \frac{836\times t}{4.2}=1000\times 1\times (40-10)[\text{ using }Q=mst]\\ & \Rightarrow t=150\text{ sec. }\end{array}$$