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X and Y start walking towards each other at 8:00 am at the speeds of 3 km/h and 4 km/h, respectively. They were initially 17.5 km apart. At what time do they meet?

Correct Answer: 10 : 30 am

Explanation:

Let they meet after x h.
Then, according to the question,
3x + 4x = 17.5
⇒ 7x = 17.5
∴ x = 17.5 / 7 = 2.5 h
So, they meet 2.5 h after 8:00 am.
It means they meet at 10:30 am.


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