A car is travelling at a uniform speed. The driver sees a
milestone showing a 2-digit number. After travelling for an
hour the driver sees another milestone with the same digits
in reverse order. After another hour the driver sees
another milestone containing the same two digits. What is
the average speed of the driver.
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Answer / rajesh
Answer is 45.
Driver first sees 16 then 61 and then 106.
106-61=45
61-16=45
| Is This Answer Correct ? | 76 Yes | 9 No |
Answer / kcs
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)
After solving, we get ----> y=6x but since x and y are
digits so only possible combination is x=1 and y=6,
So average speed = 45 KM/HR
| Is This Answer Correct ? | 33 Yes | 2 No |
Answer / ram
Rajesh is correct.
It mentiones clearly that the car is moving in a uniform
speed. hence we have to find a number ab (b - units place
and a - tens place, eg, in number 46, a = 4 and b = 6)such
that ba-ab = axb - ba. Only then the speed will be
uniform.. The only combination possible that way is 16,61
and 106. hence the average speed is 45 km/hr
| Is This Answer Correct ? | 26 Yes | 9 No |
Answer / krishna
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)
After solving, we get ----> y=6x but since x and y are
digits so only possible combination is x=1 and y=6,
So average speed = 45 KM/HR
the distance traveled between 1st mile stone and 2nd milestone is 61-16 = 45 and the distance traveled between 2nd and 3rd is 106-61 = 45 , so the average speed is 45 km/hr
| Is This Answer Correct ? | 9 Yes | 1 No |
Answer / gireesh jayabalan
Rajesh & Ram are wrong .. b'coz think of the driver is going
from kanniyakumari to kashmir let it be Kashmir 1000miles
after few miles the driver will see kashmir 800 miles
after few miles he cud see Kashmir 600miles
...................
So while travelling from one place to another the distance
will decrease .. it won't increase
| Is This Answer Correct ? | 5 Yes | 4 No |
Answer / james bond
@krisha:how cud u take (100x+y). u can use only 2 digits for the third no. u cant add 0.......
| Is This Answer Correct ? | 1 Yes | 0 No |
Answer / ramesh
I don't think Rajesh is correct....on which property based
he did the question.....bcoz at driver have to see only 2
digit number...
| Is This Answer Correct ? | 3 Yes | 8 No |
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