Let speed of boat in still water and speed of boat in upstream be ‘12x’ km/h and ‘11x’ km/h, respectively. Speed of stream = 12x – 11x = x km/h Speed of boat in downstream = 12x + x = 13km/h So, 13x = 260/4 => x = 5 Speed of boat in still water = 12 × 5 = 60 km/h Desired time = 40/60 x 60 = 40 minutes
Simplify:
72 – 4(40 + 24 ÷ 8 × 6 – 4 × 4) + 20
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