Question

a person must travel distance 65/6 km. if he moves 3 km per hour faster than he would have reached 15 minutes earlier. if he moves 5 kilometre per hour slower than he will reach 65 minutes late. His original speed was

Answer 1

here is ur answer....
hope u get it.
there is nothing much in it but the way of finding answer lies in a simple physics formula.
here in the last bit of solving I jst simplified the equation 1 and solved it together with equation 2