Aptitude - Races and Games - Discussion
Discussion Forum : Races and Games - General Questions (Q.No. 2)
2.
A and B take part in 100 m race. A runs at 5 kmph. A gives B a start of 8 m and still beats him by 8 seconds. The speed of B is:
Answer: Option
Explanation:
| A's speed = |  |
5 x | 5 |  m/sec |
= | 25 | m/sec. |
| 18 | 18 |
| Time taken by A to cover 100 m = | |
100 x | 18 | sec |
= 72 sec. |
| 25 |
Time taken by B to cover 92 m = (72 + 8) = 80 sec.
| B's speed = |
|
92 | x | 18 | kmph |
= 4.14 kmph. |
| 80 | 5 |
Discussion:
29 comments Page 2 of 3.
Sag said:
1 decade ago
We are adding 8 second to cmplete 100m for b. So why his speed is calulated for 92 m. It should be for 100m and answer should be 4. 25.
Ashutosh kumar said:
9 years ago
A --> 100m.
B --> 92m.
Above is the situation B covers 92m in 72 + 8 = 80s therefore we have taken 92m to calculate the speed of B.
B --> 92m.
Above is the situation B covers 92m in 72 + 8 = 80s therefore we have taken 92m to calculate the speed of B.
Jaanvi said:
1 decade ago
@anamika & sayed
A's speed is in kmph. to make it in m/s, 5 is multiplied with 1000/(60X60).
Hence, 5X5/18=25/18
A's speed is in kmph. to make it in m/s, 5 is multiplied with 1000/(60X60).
Hence, 5X5/18=25/18
RAJESH said:
1 decade ago
We should understand the ques properly. Its in the ques that b is 8m forward than a in 100m race, am I right?
Prasanna said:
1 decade ago
Why can't we change the distance into km and solve?. I am not getting the answer in that way.
(1)
Sravs said:
9 years ago
18/5 is the conversion of m/s to km/hr. Because option is in km/hr. We need to convert.
Manisha said:
9 years ago
I can't understand why we have to use 18/5, where it come from? Can anyone explain?
Baburaj said:
1 decade ago
Why Time taken by B to cover 92 m = (72 + 8) = 80 sec. comes?
Can any one explain ?
Can any one explain ?
Naresh.Ravula said:
1 decade ago
While finding the speed of the B, why we are using the 92m only instead of 100m?
Mangesh said:
1 decade ago
Since both are covering 100m finally. So why we took 92m instead 100m ?
(1)
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers