Posted by Ann on Thursday, July 14, 2011 at 4:22pm.
a train leaves a station and travels north at 85 km/hr. Four hours later, a second train leaves on a parrallel track and travels north at 125km/hr. How far from the station will they meet?

Algembra  Henry, Friday, July 15, 2011 at 5:34pm
Train #1 = t hrs.
Train #2 = (t4)hrs.
When train #2 catches up, they would have traveled the same distance:
d1 = d2.
85t = 125(t4),
85t = 125t  500,
125t  85t = 500,
40t = 500,
t = 12.5 hrs.
d = Vt = 85 * 12.5 = 1062.5km.
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