Since the man (M) is standing halfway between T and L, it means that:
TM = ML
Since :
TM = (10x+5)m
ML = (5x+105)m
(10x+5)m = (5x+105)m
10x+5 = 5x+105
Solving for x:
10x-5x = 105-5
5x=100
x=100/5
x = 20
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