Two trains leave a station at the same time, heading in opposite directions. One train is traveling at 80 km-h, the other at 90 km-h. How long will it be for the trains to be 425 km Apart? distance = rate x time d = rt One train rate = 80 time = t {they left at the same time} d = 80t {distance = rate x time} Other train rate = 90 time = t {they left at the same time} d = 90t {distance = rate x time} To find out when they are 425 apart, add the distances and set equal to 425 80t + 90t = 425 {added distances and set equal to 425} 170t = 425 {combined like terms} t = 2.5 {divided both sides by 170} In 2.5 hours, they will be 425 km apart © Algebra House
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