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.

4 km/hr.

6 km/hr

8 km/hr

14 km/hr

Solution: Let the speed be x km/hr. then, 15x - (15 * 29x/30) = 3 => 30x-29x = 3*2 => x = 6 km/hr.

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