<PRE><B>Question 824218</B>
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head start trainA:
s = d / t
d = s * t
d = 45 * 1
d = 45 miles
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relative speed:
60 - 45 = 15 mph
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time to the meeting, after trainB departs:
t = d / s
t = 45/15
t = 3
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answer:
trainA will have been traveling 4 hours when trainB catches up
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Solve and graph linear equations:
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Solve quadratic equations, quadratic formula:
https://sooeet.com/math/quadratic-formula-solver.php
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Solve systems of linear equations up to 6-equations 6-variables:
https://sooeet.com/math/system-of-linear-equations-solver.php</PRE>