Ghazi Emir Jennings's answer to .'s Secondary 4 E Maths Singapore question.
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Let x be the speed of the canoe in still water.
Speed upstream = (x-5), since the canoe is moving against the current you have to minus 5
Time taken upstream = 12 ÷ (x-5)
Speed downstream= (x+5), since the canoe is moving with the water the speed is greater hence plus 5
Time taken downstream = 12 ÷ (x+5)
Total time taken = 1.5 hours
12 ÷ (x-5) + 12 ÷ (x+5) = 1.5
From here, you can form a quadratic equation and solve for x
Negative answer is rejected since speed cannot be negative. Hope this helps :) jia you!
Speed upstream = (x-5), since the canoe is moving against the current you have to minus 5
Time taken upstream = 12 ÷ (x-5)
Speed downstream= (x+5), since the canoe is moving with the water the speed is greater hence plus 5
Time taken downstream = 12 ÷ (x+5)
Total time taken = 1.5 hours
12 ÷ (x-5) + 12 ÷ (x+5) = 1.5
From here, you can form a quadratic equation and solve for x
Negative answer is rejected since speed cannot be negative. Hope this helps :) jia you!
Date Posted:
2 years ago
Sorry for formatting issues, still trying to work out the kinks of the app. I hope it is still legible though ☺️
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