a cistern can be filled by one tap in 2 whole 1/2 hours and by another

1.	a cistern can be filled by one tap in 2 whole 1/2 hours and by another in 3 whole 3/4 hours. how long will cistern take to fill if they are opened together?
Answer» Answer: Step-by-step explanation: A will FILL the TANK in 2.5 HOURS B will fill the tank in 3.75 hours A+B OPENED together will fill in 1/2.5 + 1/3.75 = 1.488 hours shortcut METHOD is using equation xy/x+y 2.5*3.75 /(2.5+3.75) = 9.375/6.25 = 1.488 hours

a cistern can be filled by one tap in 2 whole 1/2 hours and by another in 3 whole 3/4 hours. how long will cistern take to fill if they are opened together?

Answer»

Answer:

Step-by-step explanation:

A will FILL the TANK in 2.5 HOURS

B will fill the tank in 3.75 hours

A+B OPENED together will fill in

1/2.5 + 1/3.75 = 1.488 hours

shortcut METHOD is

using equation

xy/x+y

2.5*3.75 /(2.5+3.75) = 9.375/6.25 = 1.488 hours