Two taps A and B can fill a cistern in 4 hours and 6 hours respectively. In the beginning, both taps are opened but after 2 hours first tap is turned off. How much longer will the tank take to fill?
a) 2 hours
b) 3 hours
c) 1 hours
d) 4 hours
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Answer:
Answer is 1 hour
Step-by-step explanation:
In one hour both tap together will fill 1/6+1/4 of cistern.ie,5/12 of total volume. so in two hour 5/6 of total volume will complete. Pending is 1/6. So two complete this tap 2 require 6×1/6 ie, 1 hr
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