Two trains A and B start from Delhi and Kolkata towards Kolkata and Delhi respectively. After passing each other, they take 10 hours and 2 hours 30 minutes respectively to reach their destinations. If Train A is moving at the speed of 37.5 kmh", what is the speed of Train B ?

A train travelling at 32 kmh"1 leaves from Delhi at 7am, and another train travelling at the speed of 40 kmh- 1 starts at 3pm in the same direction. How many km from Delhi will they meet ?

At a certain rate of simple Interest Rs 600 amounted to Rs 750 in 3 years. If the rate of interest be increased by 4%, what will be the amount after 3 years ?