Danny Low's answer to Troubled's Primary 6 Maths Speed Singapore question.
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Hope this helps
Date Posted:
1 year ago
The answer is 3 hours 45 mins
From the time they met (means together at a specific point between X and Y) to the time they were 315km apart, the time taken should be 2 hr 15 min as my working.
It appears that the period starting from the time they were 210km apart to the time they got to the meeting point (210/140 = 1.5hr) had been added to 2 hr 15 min, making it a total of 3 hr 45 min.
I interpreted the question as it was only asking for the time starting from the point they met, that's why I didn't add the 1.5 hr. You may want to clarify.
It appears that the period starting from the time they were 210km apart to the time they got to the meeting point (210/140 = 1.5hr) had been added to 2 hr 15 min, making it a total of 3 hr 45 min.
I interpreted the question as it was only asking for the time starting from the point they met, that's why I didn't add the 1.5 hr. You may want to clarify.
Sorry, Mr Low. Now, I get it. Thank you very much for the detailed explanation. Truly appreciate! By the way, I got one more speed question. Don’t know if u can help. I will have it posted. Thanks in advance!
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