It takes 6 hours for a tap to fill a tank. Three additional identical taps are unlocked once half of the tank has been filled. How long did it take to totally fill the tank?
A. 3 hrs 15 min
B. 3 hrs 45 min
C. 4 hrs
D. 4 hrs 15 min
Answer:B
It takes 6 hours for a tap to fill a tank. Three additional identical taps are unlocked once half of the tank has been filled. How long did it take to totally fill the tank?
A. 3 hrs 15 min B. 3 hrs 45 min C. 4 hrs D. 4 hrs 15 min
Explanation: One tap takes 3 hours to fill half of the tank.Part filled in 1 hour by four taps = 4 x 1/6 = 2/3,1 - 1/2 = 1/2 is the remaining half.,2/3 : 1/2 : 1 : x ,x = 1/2 x 1 x 3/2 = 3/4 hour, or 45 minutes.As a result, the total time spent was 3 hours. 45 minutes.