A snail crawls for 7 minutes at a speed of 4 cm per minute, rests for 3 minutes, then continues to crawl a further 30 cm in 12 minutes.
What is its average speed?
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A snail crawls for 7 minutes at a speed of 4 cm per minute, rests for 3 minutes, then continues to crawl a further 30 cm in 12 minutes.
What is its average speed?
To solve this problem, we will calculate the average speed of the snail by considering both its movement and rest periods. The average speed is calculated using the formula:
.
Let's break down the calculation:
Step 1: Calculate the distance covered during the first crawling period.
The snail crawls at 4 cm/min for 7 minutes. Thus, the distance covered in this period is:
.
Step 2: Note the rest period.
The snail rests for 3 minutes. This time needs to be included in the total time calculation.
Step 3: Calculate the distance and time covered in the second crawling period.
The snail crawls 30 cm in 12 minutes. Hence:
Distance in this period is , and the time is .
Step 4: Calculate the total distance.
Total distance = .
Step 5: Calculate the total time.
Total time = .
Step 6: Calculate the average speed using the total distance and time.
.
Therefore, the average speed of the snail is cm per minute.
cm per minute
What is the average speed according to the data?
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