A boy can reach a certain place in 45 hours. If he reduces his speed by 1/30th, he goes 3 km less in that time. Find his speed.  Answers:  A) 2 km/hr.  B) 6 km/hr  C) 8 km/hr  D) 14 km/hr  E) None of these
Explanation :   Solution: Let the speed be x km/hr. then,   45x - (45 * 29x/30) = 3   =&gt; 3/2X =3   X=2   2 km/hr.
<result>A</result>
A boy can reach a certain place in 45 hours. If he reduces his speed by 1/30th, he goes 3 km less in that time. Find his speed.