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Let the speeds of boats ‘A’ and ‘B’ in still water be 8x km/hr and 9x km/hr Therefore, speed of the current = 0.25 × 8x = 2x km/hr According to the question, 8x + 2x = 810/9 Or, 10x = 90 Or, x = 9 Therefore, upstream speed of boat ‘B’ = 9x – 2x = 7x = 63 km/hr Downstream speed of boat ‘B’ = 9x + 2x = 11x = 99 km/hr Required time taken = (252/63) + (792/99) = 4 + 8 = 12 hours
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High Water Use Efficiency (WUE)
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