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 English interview questions  English Interview Questions (465)
 General Aptitude interview questions  General Aptitude Interview Questions (1900)
 Puzzles interview questions  Puzzles Interview Questions (460)
Question
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.
 Question Submitted By :: General-Aptitude
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
Answer is 45.
Driver first sees 16 then 61 and then 106.
106-61=45
61-16=45
 
Is This Answer Correct ?    58 Yes 6 No
Rajesh
 
Answer
# 2
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 ?    19 Yes 0 No
Kcs
 
 
 
Answer
# 3
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 ?    22 Yes 8 No
Ram
 
Answer
# 4
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 ?    8 Yes 0 No
Krishna
 
Answer
# 5
45..... rajesh and ram are right 
Is This Answer Correct ?    3 Yes 0 No
Kcs
 
Answer
# 6
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 3 No
Gireesh Jayabalan
 
Answer
# 7
@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
James Bond
 
Answer
# 8
0
because car is running not the driver.
 
Is This Answer Correct ?    11 Yes 12 No
Sakshi
 
Answer
# 9
the avg of the car is 30 
Is This Answer Correct ?    1 Yes 5 No
Guest
 
Answer
# 10
in first hour 16
then 2 nd hour 61
then 3rd hour 116
now 116-61=55
ans is 55km/h
 
Is This Answer Correct ?    0 Yes 4 No
Vikash Singh
 

 
 
 
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