cm(t-t1)+3cm(t-3t1)=0
t-t1+3t-9t1=0
4t=10t1
t=2.5t1=2.5*20=50
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cm(t-t1)+3cm(t-3t1)=0
t-t1+3t-9t1=0
4t=10t1
t=2.5t1=2.5*20=50