Question
A boat takes 7 hours to cover 273 km upstream and 9
hours to cover 441 km downstream. Find the time taken by the boat to cover 540 km upstream and 459 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 = 273/7 = 39 km/h Downstream speed = 441/9 = 49 km/h Speed of boat in still water = (39 + 49)/2 = 44 km/h  Speed of stream = (49 – 39)/2 = 5 km/h Increased speed of boat in still water = 44 + 4 = 48 km/h Decreased speed of stream = 5 – 2 = 3 km/h Required time taken = 540/(48 – 3) + 459/(48 + 3) = 12 + 9 = 21 hours
Find the appropriate word.
In Argentina in 2014, people first discovered Titanosaurs, ______ are dinosaurs.
Fill in blank 1 with the appropriate word from the options.
Find out the appropriate word in 1.
Select the most appropriate option for blank No. 4.
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Blank 27
Choose an appropriate word that fits the blank 200.
Alyssa Healy and her merry bunch will be the team that most squads, including old rival England, will be want to knock off the pedestal.
From the following select the appropriate word to replace number (49) in the above passage.Â
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