A man can reach a certain place in 30 hours. If he reduces his speed by 1/15th, he goes 10 km less in that time. Find his speed.  Choices:
A) 4 1/2km/hr	B) 5 km/hr	C) 5 1/2km/hr	D) 6 km/hr	E) none
Sol.   Let the speed be x km/hr. Then,   30x-30*14/15x = 10   ⇔ 2x = 10   ⇔ x = 10/2= 
<gadget id="calculator">10/2</gadget>
<output>5</output>
5 km/hr   Answer 5 km/hr
<result>B</result>
A man can reach a certain place in 30 hours. If he reduces his speed by 1/15th, he goes 10 km less in that time. Find his speed.