A boat can travel at a speed of 20km/hr in still water. The current in a river flows at 5 km/hr so that downstream the boat travels at 25 km/hr and upstream it travels at only 15 km/hr. The boat has only enough fuel to last 3 hours. The boat leaves its base and travels downstream. Draw a distance - time graph and draw lines to indicate the outward and return journeys. After what time must the boat turn around so that it can get back to base without running out of fuel ?
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