The length RT is 18
How to determine the length RT?
The given parameters are:
- S is between R and T
- The distance between R and T is 3 times the distance between R and S
This means that
RT = RS + ST
Where
RT = 3RS
So, we have
3RS = RS + ST
Evaluate
2RS = ST
Also, we have
ST = 12
This gives
2RS = 12
RS = 6
Recall that RT = 3RS
RT = 3 * 6
RT = 18
Hence, the length RT is 18
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