two trains for palwal leave kanpur at 10a.m and 10:30 am and travel at the speeds of 60 kmph and 75 kmph respectively. After how many kilometers from kanpur will the two trains be together?
A certain sum of money is invested and compounded annually. That sum increases to 4 times, in 4 years. In how many years, the sum increases to 16 times the principle amount?