210. Shagun has devised an automatic rain shelter system for the clothes-line at home.
This system will sense rain and immediately unroll a plastic sheet on top of the
clothes-line thereby preventing it from getting wet.
As the number of clothes-lines varies from house to house, the distance which has to
be covered by the plastic sheet will vary. This distance can be pre-set in the system
while fixing it at the house.
At what speed should the sheets unroll so that they cover a distance of 10 min 5 s?
1 2 m/s
2 10 m/s
3 50 m/s
4 cannot say without knowing the number of clothes-lines
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Explanation:
speed = distance / time
= (10) min / (5) sec
= 2 m/s
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