A boat can cover 185 km in downstream in 5 hours and 120 km in upstream in 12 hours. Find the speed of boat in still water.
Downstream speed of the boat = 185/5 = 37 km/hr Upstream speed of the boat = 120/12 = 10 km/hr Speed of boat in still water = (37 + 20)/2 = 23.5 km/hr
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The human eyes form the image of an object at its:
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