1.

A Person Travels In A Car With Uniform Speed. He Observes The Milestone,which Has 2 Digits. After One Hour He Observes Another Milestone With Same Digits Reversed. After Another Hour He Observes Another Milestone With Same 2 Digits Separated By 0. Find The Speed Of The Car ?

Answer»

Let 10'splace DIGIT is x and unit's place digit y

FIRST MILESTONE : 10x+y

Second milestone : 10y+x

Third milestone: 100x+y

Since the speed is uniform so

Distance covered in first HR = Distance covered in Second Hr

(10y+x)-(10x+y) = (100x+y)-(10y+x)

By solving,

y=6x 

but since x and y are DIGITS so only possible combination is x=1 and y=6,

So average speed = 45 Kmph

Let 10'splace digit is x and unit's place digit y

First milestone : 10x+y

Second milestone : 10y+x

Third milestone: 100x+y

Since the speed is uniform so

Distance covered in first Hr = Distance covered in Second Hr

(10y+x)-(10x+y) = (100x+y)-(10y+x)

By solving,

y=6x 

but since x and y are digits so only possible combination is x=1 and y=6,

So average speed = 45 Kmph


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