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? Select:
A) 3 km B) 2 km C) 8 km D) 6 km E) 9 km
D   Average speed = (2 * 3 * 2) / (3 + 2) = 12/5 km/hr.   Distance traveled = 12/5 * 5= 
<gadget id="calculator">12/5 * 5</gadget>
<output>12</output>
12 km.   6 kmistance between house and school= 12/2= 
<gadget id="calculator">12/2</gadget>
<output>6</output>
6 km.
<result>D</result>
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?