A bucket full of hot water is kept in a rooom and it cools from 75 celcius to 70 celcius in t1 min ,from 70 to 65 in t2min the 65 to 60 in t3min put the time in ascending order
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T1-T2/time = k ( T1+T2/2 - T(surronding)) now put the values of temp and time. Keep time and tsurr as it is in the form of variable only we have 3 different time so we get 3 eq. .5/t1 = k (135/2- Tsu) ,5/t2 = k (125/2-Tsu), .5/t3 =k (115/2 -Tsu) divide two eq at a time the you get a idea about t1, t2 and t3 so you get option b ... hope it helps
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