The door makes a clicking noise and locks. The zombie beats on the door in vain for a few minutes before letting out a sad sigh and leaving. You survey the room and notice a large locker. Inside sits a giant block ice with a zombie encased in it! Was that crazy cabin owner freezing zombies? What's worse, the 1000kg block of ice has just begun melting because it is submerged in 500kg of 50C water!

Latent heat of fusion for water: ~3x10^5 J/kg
Specific heat of water: ~4x10^3 J/kg C

If you think the ice will melt due to the water, you had better escape right now because that zombie looks hungry!