plz solve this sum its urgent
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heya answer is here...........
ANSWER MAY BE HELPS YOU DEAR.......
ANSWER MAY BE HELPS YOU DEAR.......
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aflak55:
formalue kaun se hai
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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
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
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