Question

2 pipes A &B can fill a tank in 20 and 30 minutes respectively. If 2 pipes are open together what will be the time taken together

Answer 1

Answer:

This is a simple pipe and Cisterns(tank) problem. Please follow the step by step instructions.

Step-by-step explanation:

Part filled by A alone in 1 minutes= (1/20)

Part filled by B alone in 1 minutes= (1/30)

Now, Part filled by (A+B) in 1 minutes= (1/20) + (1/30) = (1/12)

Hence,  both pipes together will fill the tank in = {1/(1/12)} = 12 minutes

And the answer is : 12 minutes

Answer 2

Answer:

12 mins

Step-by-step explanation:

2 pipes A &B can fill a tank in 20 and 30 minutes respectively. If 2 pipes are open together what will be the time taken together

Pipe A can fill tank  in 20 min

Tank filleedd by Pipe A in 1 min = 1/20

Pipe B can fill tank  in 30 min

Tank filleed by Pipe B in 1 min = 1/30

Tank filled by Pipe A & Pipe B  together in 1 Min

= (1/20) + (1/30)

= 3/60 + 2/60

= 5/60

= 1/12

Tank filled in 1 min = 1/12

Tank will be fille in 12 mins