Question 354501: There are more than 1/4 million species of beetle. Assume the average length of a beetle is 1cm and the average walking speed is 10 cm per second. These beetles walk up a gang-plank that is 5 meters long onto an ark. They do this in pairs, side by side, one male and one female from each species. The pairs of beetles are spaced 7 cm apart. How many hours will it take for 1/4 million species of beetles to embark onto the ark once the first pair starts up the gangplank?
Answer by mananth(16946)   (Show Source):
You can put this solution on YOUR website! there are 1/4 million beetles
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250,000 beetles
they move side by side in pairs
250,000 /2 = 125,000 pairs form a line.
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length of each beetle 1 cm
distance = 7cms between them.
total distance = 8cm.
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125,000 form a line
so total length = 125,000 * 8 = 1000,000 cms is the length of the line.
the length of the plank = 500 cm
so the distance covered = 1000,000+500 = 1000,500 meters
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distance = 1000,500 cm
speed = 10 cm/s
Time = distance / speed
Time = 1000,500/10
Time = 100050 seconds
27.8 hours
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m.ananth@hotmail.ca
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