A boy walks a certain distance at 9km/hr. He find if he increase his speed by 1/3, he would have save 1 1/3 hours. Find the distance he walk?
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Question

A boy walks a certain distance at 9km/hr. He find if he increase his speed by 1/3, he would have save 1 1/3 hours. Find the distance he walk?
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perl · Answer

d = 9t 
d = ( 9 + 1/3*9) ( t - 4/3)

perl · Answer

I get t = 16/3

perl · Answer

so d = 9*(16/3) = 48 km

callisto · Answer

Let t be the original time taken
s = x/t, x=st
Therefore
9t = 9 [1+(1/3)] (t- 1 1/3)
9t = 12t -16
t = 16/3

Distance travelled = st = 9 (16/3) = 3 x 16 = 48 km

Sorry i'm slow

anonymous · Answer

thanks dear

callisto · Answer

* the distance travelled is the same
so s1t1 = s2t2