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K and L starts walking towards each other at 4 pm at speed of 3 km/hr and 4 km/hr respectively. They were initially 17.5 km apart. At what time do they meet ?

Correct Answer: 6:30 pm

Explanation:

Suppose they meet after 'h' hours


Then


3h + 4h = 17.5


7h = 17.5


h = 2.5 hours


So they meet at => 4 + 2.5 = 6:30 pm


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