Question

Please solve this question ​

Answer 1

Answer:

(d) 14min40sec

Step-by-step explanation:

Tank filled by pipe A in 4 min =4/15

Tank filled by pipe B in 20 min = 4/20

Adding both we get tank filled by both pipe in 4 min = 28/60

Remaining part of the tank that need to be filled= (60-28)/60

=32/60

It will be filled by pipe B = (20×32)/60= 10min 40sec

Time required to fill the tank = 10min40sec+4min(in the starting)

14min 40sec