Answer: 370 minutes.
Explanation:
You can calculate the time by using the formula of rate:
rate = amount / time = number of drops / time
From which you clear the time:
time = number of drops / rate
The rate and the number of drops are given: 41 drops / minute and 15,000 drops (since that is the number of dropos in 1.00 gallons).
Therefore, time = 15,000 drops / 41 drops / minute = 365.85 minutes
You have to use the correct number of significant figures, which is the least number of significant figures in every factor. 41 has two significant figures, 15,000 also has two significant figures, while 1.00 has three significan figures.
So you must round 365.85 minutes to two significan figures.
That is 370 (365 is round up to 370).
