Explanation:
Speed of the boat in still water = (Downstream Speed + Upstream Speed) / 2 = (18 + 12) / 2 = 15 km/h. Distance covered in 3 hours = 15 * 3 = 45 km.
Excluding stoppages, the speed of an express route train is 90 km/h and including stoppages it is 72 km/h. How many minutes does the train stop per hour?
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