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 3 of 3.
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
Sayed said:
1 decade ago
How A's speed is found ?
Anamika Sinha said:
1 decade ago
How did you get A's speed ? I dint understand. Please explain.
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.
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 ?
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.
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?
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. !
Naresh.Ravula said:
1 decade ago
While finding the speed of the B, why we are using the 92m only instead of 100m?
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