Question 975870
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A and B are playing tag . A stay still while B runs from the same spot at a rate 2 meters per second. 
After 60 seconds B keeps running . A now runs after him at a rate of 3 meters per second. 
How long has A run when he caught up to B


My solution
3 (t-60) = 2t
3t - 180 =2t
3t-2t =180
t = 180
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Your error is that you determined the time for B, 
while the problem asks about the time for A.