A boy is traveling from his house to school at 10km/hr and reached school 2hours late. Next day he traveled 20km/hr and reached 1hour early. Then find the distance between house and school?  Select
A) 50km  B) 45km  C) 33km  D) 60km  E) 54km
Let distance be x   S1 = 10km/hr   S2 = 20km/hr   T1 = x/10hr   T2 = x/20hr   60kmifference in time = 2+1= 
<gadget id="calculator">2+1</gadget>
<output>3</output>
3hr   (x/10)-(x/20)= 3   x = 60km   Answer is 60km
<result>D</result>
A boy is traveling from his house to school at 10km/hr and reached school 2hours late. Next day he traveled 20km/hr and reached 1hour early. Then find the distance between house and school?