1
vote
1answer
64 views

Why are we adding instead of subtracting?

The problem statement: Distance between two stations A and B is 230 km. Two motorcyclist starts simultaneously from A and B in opposite directions and the distance between them after 4 hours ...
1
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4answers
126 views

How much percent new content does Grandpa write in the morning?

Grandpa is writing a book. Every morning he starts writing vigorously and fills a lot of pages. But post-lunch he goes through all that he's written that far (right from day one) and deletes one-fifth ...