Question
A boat takes 7 hours to cover 245 km upstream and 10
hours to cover 450 km downstream. Find the time taken by the boat to cover 533 km upstream and 329 km downstream if speed of boat in still water is increased by 4 km/h and speed of stream is decreased by 2 km/h.Solution
Upstream speed = 245/7 = 35 km/h Downstream speed = 450/10 = 45 km/h Speed of boat in still water = (35 + 45)/2 = 40 km/h  Speed of stream = (45 – 35)/2 = 5 km/h Increased speed of boat in still water = 40 + 5 = 45 km/h Decreased speed of stream = 5 – 2 = 3 km/h Required time taken = 533/(45 – 3) + 329/(45 + 3) = 13 + 7 = 20 hours
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