Question
Speed of a boat in still water to speed of boat in
upstream is 10: 9. If the boat can travel 220 km in downstream in 8 hours, then find the time taken by the boat to cover 25 km in still water.Solution
Let speed of boat in still water and speed of boat in upstream be ‘10x’ km/h and ‘9x’ km/h, respectively. Speed of stream = 10x – 9x = x km/h Speed of boat in downstream = 10x + x = 11x km/h So, 11x = 220/8 => x = 2.5 Speed of boat in still water = 10 × 2.5 = 25 km/h Desired time = 25/25 x 60 = 60 minutes
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