A person crosses a 600 m long street in 5 minutes. What is his speed in km per hour?

A sum of money at simple interest amounts to Rs. 815 in 3 years and to Rs. 854 in 4 years. The sum is:

Divide rs.1870 into three parts in such a way that half of the first part, one-third of the second part and one- sixth of the third part are equal. The first part will be equal to?