Question

two pipes a and b can fill a tank in 20 minutes and 30 minutes respectively . If initially only pipe b was kept open for 2/5th of the total time and both pipes a and b were kept open for the rest of the time then how many minutes would both pipes take to fill the tank
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Answer 1

Step-by-step explanation:

ANSWER

Part of tank filled by 1st pipe in 1 minute =

20

1

Part of tank filled by 2nd pipe in 1 minute =

30

1

∴ Part of tank filled by both the pipes in 1 minute =(

20

1

+

30

1

)=

60

5

=

12

1

Time taken to fill the tank =12 minutes

Answer 2

Answer:

sorry ........................