A tap can fill a tank in 4 hours.
A tap can fill a tank in 4 hours. After half the tank is filled three more similar taps are opened. What is the total time taken to fill the tank completely?
Answer/Solution
3 hrs 30 min
Steps/Work
Time taken by one tap to fill the tank = 2 hrs.
Part filled by the taps in 1 hour = 4 * 1/4 = 1
Remaining part = 1 - 1/2 = 1/2
1 : 1/2 :: 1 : x
x = 1/2 * 1 * 1 = 1/2 hrs. i.e., 30 min
So, total time taken = 3 hrs 30 min.
ANSWER: D
Part filled by the taps in 1 hour = 4 * 1/4 = 1
Remaining part = 1 - 1/2 = 1/2
1 : 1/2 :: 1 : x
x = 1/2 * 1 * 1 = 1/2 hrs. i.e., 30 min
So, total time taken = 3 hrs 30 min.
ANSWER: D