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The doctor gives you three pills and tells you to take one every half hour. How long before you run out of pills?

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The doctor gives you three pills and tells you to take one every half hour. How long before you run out of pills?
posted Oct 7, 2014 by Varun Kumar

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Lalit is taking the train to the Library. He tells Roshni the hour of his train’s departure and he tells Anu at which minute it leaves. He also tells them both that the train leaves between 0600 and 1000.

They consult the timetable and find the following services between those two time:
0632 0643 0650 0717 0746 0819 0832 0917 0919 0950

Roshni then says “I don’t know when Lalit’s train leaves but i am sure that neither does Anu”

Anu Replies “I didn’t know his train, but now i do”

Roshni responds “Now I do as well!”

When is Lalit’s train and how do you know?

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