IKMC 2027 - Grades 7-8 - Self-study SET 14 - Thematic Batch 3 Question 29

Tourists take a riverboat whose speed in still water is 20 km/h. The current flows at 4 km/h. They want to go out and return to their starting point within three hours. How far from the start can they travel at most?

Editorial interpretation: “How far” means the greatest one-way distance from the starting point, with no time spent stopping.