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.
Qwaci said:
1 decade ago
@ Sag & Mangesh.
First of all, A gave B a start of 8m so B did not run 100m but 92m (100m-8m). Secondly, A took 72sec to cover the 100m and still won B who had only 92m to run by 8sec which means that with the 92m that B covered he used or needed 80sec (72sec+8sec). I hope my little explanation could help you understand.
First of all, A gave B a start of 8m so B did not run 100m but 92m (100m-8m). Secondly, A took 72sec to cover the 100m and still won B who had only 92m to run by 8sec which means that with the 92m that B covered he used or needed 80sec (72sec+8sec). I hope my little explanation could help you understand.
(1)
Mangesh said:
1 decade ago
Since both are covering 100m finally. So why we took 92m instead 100m ?
(1)
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.
Sanju said:
1 decade ago
Out of 100m he ran 8m so we deduct 8m from 100m then we get 92m to obtain B Speed we should caluclate B Speed by using 92m instead of 100m. I hope you understand. !
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?
Anusha said:
5 years ago
Nice explanation, thanks @Buddhika.
Padma said:
1 decade ago
Here first we can find the losers time, secondly we can find losers distance[since losers distance=winners distance- (start distance+beat distance) ] and later we can find the speed of B[since speed=distance/time]. Which is the final answer.
Is this not the correct procedure. Please tell me if it is.
Is this not the correct procedure. Please tell me if it is.
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 ?
Sileshi said:
6 years ago
How come 5/18? Please tell me.
Sudharshan madgula said:
1 decade ago
@Baburaj:
Because A is taking 72sec to run 100m and beats B by 8sec.
that means still B needs 8sec to complete 100m.
therefore time taken by B to complete 92m is 72+8=80sec.
Because A is taking 72sec to run 100m and beats B by 8sec.
that means still B needs 8sec to complete 100m.
therefore time taken by B to complete 92m is 72+8=80sec.
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