A website Maths Puzzle Numerical Ability

1. David invested Rs 1000 in a bank that offers simple interest at the rate of 12% per annum. John invested same amount in another bank which offers compound interest at rate of 10%. After how many years for the first time will John get more interest than David?

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I renovated my bathroom and got myself a new bath tub along with new accessories. I have two taps now - hot one and cold one. The hot tap fills the bath tub faster i.e. in fifteen minutes while it takes eighteen minutes for the cold tap to fill the bath tub.

The drain hole can drain the entirely filled bathtub in ten minutes when the taps are not running.

If I leave both the taps on with the drain plug left out, how long will it take the bath to fill? 1,3,6,11,18,29,42...