Interval and Pickup Problems: Problem 2

Problem: Every equal number of minutes a new tram travels from the tram station. A and B are walking the same direction along the same path as the trams. A sees a tram coming his way every 10 minutes, while B sees a tram coming his way every 15 minutes. If A travels at a speed three times that of B, then how many minutes is in between the departure of each tram from the station?

Key: Set functions

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