A steam engine intakes 50 g of steam at 100°C per minute and cools it down to 20°C. If latent heat of vaporization of steam is 540 cal g^-1, then the…

A steam engine intakes $\displaystyle 50$ g of steam at $\displaystyle 100$°C per minute and cools it down to $\displaystyle 20$°C. If latent heat of vaporization of steam is $\displaystyle 540 \mathrm{cal} \mathrm{g}^{-1}$, then the heat rejected by the steam engine per minute is \_\_\_\_ $\displaystyle \times 10^3 \mathrm{cal}$. (Given : specific heat capacity of water : $\displaystyle 1 \mathrm{cal} \mathrm{g}^{-1}{ }^{\circ} \mathrm{C}^{-1}$ )