Scorching goIITian
Since MC1(15-10)=MC2(25-15)=>C1/C2=2
MC2(30-25)=MC3(40-30)=>C2/C3=2
MC1(T-10)=MC3(40-T)=
4(T-10)=40-T 4T-40=40-T 5T=80 OR T=160C.