.
Claudia's rate is = 4 yards per second.
Valeria's rate is = 3 yards per second.
If t is the time after their start, then the Claudia's position is 4t yards from the start,
while Valeria's position is (3t + 20) yards from the same point.
At the catching up moment the distances are the same:
4t = 3t + 20, or
4t - 3t = 20 ====> t = 20 seconds.
Answer. Claudia will catch up Valeria in 20 seconds.
Solved.
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