A Train of length 160m with a speed of 260km/h. How much it will take to cross a brdge of 140m.......

A person will receive 10% interest after 6 month of deposition. He deposits on 1st January and 1st July in a years. What's will be the yearly interest on principal amount...? Something like this...

A, B, C, D have contribution of money with ratio 3:5:2:4. If C gets 1000 more than D what will be the amount of B...?