Next door to me lives a man his son. They both work in the same factory. I watch them going to work through my window. The father leaves for work ten minutes earlier than his son. One day I asked him about it and he told me he takes 30 minutes to walk to his factory, whereas his son is able to cover the distance in only 20 minutes.
I wondered, if he father were to leave the house 5 minutes earlier than his son, how soon the son would catch up with the father.
How can you find the answer?
You can find the answer in this site on 22.07.2008
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