Question
A boat travels 40 km downstream in 5 hours, and the same
boat travels 40 km upstream in 8 hours. Find the speed of the boat in still water.ÂSolution
Let the speed of the boat in still water be x km/h, and the speed of the stream be y km/h. Downstream speed = (x + y) km/h, and upstream speed = (x - y) km/h. Downstream: 40 / (x + y) = 5 Upstream: 40 / (x - y) = 8 From the downstream equation: x + y = 40 / 5 = 8. From the upstream equation: x - y = 40 / 8 = 5. Now solve: x + y = 8 x - y = 5 Adding both equations: 2x = 13 x = 6.5 km/h Thus, the speed of the boat in still water is 6.5 km/h.
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.
Find the appropriate word.
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
