Question

10. Two pipes A and B can fill a tank is 36 hours and 45 hours. If both are opened
simultaneously, how much time will be taken to fill the tank?
a. 20 hours
b. 18 hours c. 25 hours
d. 19 hours.​

Answer 1

Answer:

c

Step-by-step explanation:

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Answer 2

Answer:

20 hours

Step-by-step explanation:

Part filled by A in 1 hour = 1/36

Part filled by B in 1 hour = 1/45

Part filled by (A+B) in 1 hour = 1/36+1/45

=9/180

=1/20

Hence, both the pipes together will fill the tank in 20 hours.