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1. Assuming the track is straight, the distance at which they are apart one hour before they meet is; 30 km

   How to find the distance from speed and time?

   We are told that a Nonstop trains leave Toronto and Montreal at the same time each day going to the other city along the main line.

   Speed of Train 1 = 120 km/h

   Speed of Train 2 = 90 km/h

   Time spent by train 1 = 1 hour

   Time spent train 2 = 1 hour

   Formula for distance is;

   Distance = Speed * time

   If they leave the same time each day, it means that;

   Distance of train 1 = 120 * 1 = 120 km

   Distance of train 2 = 90 * 1 = 90 km

   Thus, distance at which they will be apart before meeting each other is;

   Distance apart = 120 – 90

   Distance apart = 30 km

   Read more about Distance, speed and time at; https://brainly.com/question/4931057

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