A boy goes to his school from his house at a speed of 3 km/hr and returns at a speed of 2 km/hr. If he takes 5 hours in going and coming. The distance between his house and school is :

4.5 km

5.5 km

6 km

7 km

Average speed = [2*3*2 / 3+2] km/hr = 12/5 km/hr. Distance traveled = [12/5 * 5] km = 12 km. Distance between house and school = [12/2] km = 6 km.

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