For the following questions answer them individually
The frequency of a sound wave is 25 Hz and its wavelength is 4 m. What is the time taken by the sound wave to travel a distance of 200 m ?
One pipe works three times as fast as another. The two pipes together can fill a tank in 26 minutes. By working alone, how long will the slower pipe take to fill the tank?
Find the Simple Interest on Rs.5000 at 6.25% per annum from $$5^{th}$$ February 2017 to $$19^{th}$$ April 2017.