Lets Try these puzzles today.
1. A Problem of Walking
Next door to me lives a man with 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 the 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 ?
2.No Change!
I got out of the taxi and I was paying the fare. But the taxi driver could not give me change for the rupee note. To my surprise I noticed my two friends Asha and Neesha walking towards me. I requested them to give me exact change for my rupee note. They searched their handbags and said 'No'.
They both had exactly Re 1.19 each in their handbags. But the denominations were such that they could not give the exact change for a rupee.
What denominations of change could they have had? They both, of course, had different denominations.
3. A Problem of Skiing
It was a skiing resort in Switzerland. I met a skiing enthusiast by the skiing slopes. He had a packed lunch with him. He asked me to join him for lunch back in the spot where we were standing at 1 p.m., after he had done a bit of skiing. I told him no, as I had an appointment to keep at 1 p.m. But if we could meet at 12 noon, I told him that perhaps I could manage.
Then he did some loud thinking, "I had calculated that if I could ski at 10 kilometres an hour I could arrive back at this spot by 1 p.m. That would be too late for you. But if I ski at the rate of 15 kilometres an hour, then I would reach back here at 11 a.m. And that would be too early. Now at what rate must I ski to get back here at 12 noon?....let me see".
He got the right figure and he got back exactly at 12 noon. We had an excellent lunch.
What do you think the figure was?