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Upstream speed = 266/7 = 38 km/h Downstream speed = 468/9 = 52 km/h Speed of boat in still water = (38 + 52)/2 = 45 km/h Speed of stream = (52 – 38)/2 = 7 km/h Increased speed of boat in still water = 45 + 4 = 49 km/h Decreased speed of stream = 7 – 2 = 5 km/h Required time taken = 528/(49 – 5) + 540/(49 + 5) = 12 + 10 = 22 hours
Number p is 15% more than 150. If k is 15% less than p, then k is equal to:
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