A boy goes to school at a speed of 3 km/h and returns to his village at a speed of 2 km/h. If he takes 5 hours in all, what is the distance between the school and the village? MCQ with Answer and Explanation
A boy goes to school at a speed of 3 km/h and returns to his village at a speed of 2 km/h. If he takes 5 hours in all, what is the distance between the school and the village?
A. 8 km
B. 5 km
C. 7 km
D. 6 km
Answer: Option D
Solution (By JKSSB Mock Tests)
Let distance be d. d/3 + d/2 = 5 => 5d/6 = 5 => d = 6 km.
Explanation:
Since time is inversely proportional to speed when distance is constant, the ratio of time taken is the reciprocal of the speed ratio: 1/4 : 1/7 = 7 : 4.
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