A boy can reach a certain place in 15 hours. If he reduces his speed by 1/30th, he goes 3 km less in that time. Find his speed.
Options
A) 4 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,   15x - (15 * 29x/30) = 3   =&gt; 30x-29x = 3*2   =&gt; x = 6 km/hr.   Answer : 6 km/hr
<result>B</result>
A boy can reach a certain place in 15 hours. If he reduces his speed by 1/30th, he goes 3 km less in that time. Find his speed.