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Grade: 12th pass
`        A 6ft man walks away from a 12ft lamp post at the rate of 4ft/sec. How fast is his shadow lengthening when he is 21ft from the post? A. 3ft/secB. 4ft/secC. 5ft/secD. 6ft/sec`
4 months ago

## Answers : (1)

Vikas TU
9499 Points
```							Hiii Let the length from pole to man be x Length of shadow be y From similarity of triangle find the distance x x = 10.5 Total distance of shodow from pole = 21 + 10.5 = 31.5 ftRate of shadow = distance / time for travelling 4 ft – it takes 1 sec.1 ft – ¼ sec21 ft – 21/4 31.5*4/21 = Rate of shadow = 6ft /sec, D is correct one.
```
4 months ago
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