SOLUTION: Two trains travel at speeds of 72km/h and 48km/h respectively. If they start at the same time and travel towards each other from two places 600km apart, how long will it be before

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They will meet when they travel  this initial distance of 600 kilometers between them:


72*t + 48*t = 600,

(72+48)*t = 600,

t =  = 5 hours.