A boy goes to a playground from the house at 5 km/hr by 10 minute late. If he goes at 6 km/hr. he would be 5 minutes early. What is the distance of the of playground from his house ?  Choices:
A) 7.5 km  B) 8 km  C) 10 km  D) 12 km  E) None of these
Explanation :   Solution: Let the distance be x km.   Difference in timings = 15 min = 15/60 hr = 1/4 hr.   .'. x/5 - x/6 = 1/4   =&gt; 6x-5x = 30/4   =&gt; x = 7.5 km.   7.5 kmnswer : 7.5 km
<result>A</result>
A boy goes to a playground from the house at 5 km/hr by 10 minute late. If he goes at 6 km/hr. he would be 5 minutes early. What is the distance of the of playground from his house ?