Question

plz solve this sum its urgent

Answer 1

heya answer is here...........


ANSWER MAY BE HELPS YOU DEAR.......

Answer 2

let's the school be at distance of x km.if t1 is time taken to reach school then
t1=distance/time =x/20
if t2 is time taken to reach back then
t2 =distance/time=x/40
total time,t=t1+t2=x/20+x/40=x(1/20+1/40)=5x/80=x/16
total distance =x+x=2 x
now average speed=total distance/total time
2 x divide by x/16=2 x multiple by 16/x=32km/h