A container contains water at temperature 80degree C.After every 10minutes,the change in temperature is -4 degree C.After howmuch time willthe temperature of water be 20 degree C

Answer :

Given  : temperature of water is  80°  C
And
After every 10 minutes,the change in temperature is - 4° C

Let there will be temperature change x times , So

80°   - 4x°  = 20° 


4x°  =  60° 

x  =  15 

And

Every change is occurs in 10 minutes , So 

15 ( 1) =  150  minutes  or 2 hour 30 minutes will take to the temperature of water is 20° C                ( Ans )

  • 14
2 hour and 30 minutes
  • 2
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