a student reached his school late by 20mins by travelling at a speed of 9kmph.if he had travelled at a speed of 12kmph,he would have reached his school 20mins early.what is the distance between house and school?  Pick one
A) 24
B) 25
C) 26
D) 27
E) 28
distance = distance either student reaches school before time or after time   9(t+20/60) = 12(t-20/60)   i.e   9(t+1/3) = 12(t-1/3)   9(3t+1) = 12(3t-1)   t=7/3   put t value in any of distance equation   put t= 7/3 in 9(t+1/3)   we get 24 km   24NSWER:24
<result>A</result>
a student reached his school late by 20mins by travelling at a speed of 9kmph.if he had travelled at a speed of 12kmph,he would have reached his school 20mins early.what is the distance between house and school?