Question:
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:
[A].5.15 kmph
4.14 kmph
4.25 kmph
4.4 kmph
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:
[A].
[B].
[C].
[D].
Answer: Option B
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 |