Two trains leave a station at the same time, heading in opposite directions. One train is traveling at 80 kmh, the other at 90 kmh. 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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