Question

an iron rod was heated to 200 degree celsius for cooling after every 3 minutes that's cool down by 25 degree celsius what will be the temperature of and rod after half an hour

Answer 1

here divide 200 by 25 we get 8

time taken to cool down to 0°c = 8×3 =24min

then in 30 min it will have temperature = -50°c

Answer 2

temperature of the iron when heated = 200 degree Celsius

no. of minutes after cools down = 3 minutes

temperature that decrease every 3 minutes by=25 degree Celsius

hence, 30÷3=10

25×10=250

200-250

-50 degree Celsius