Question

Pipe A can fill a tank in 10 hr and Pipe B can fill the same tank in 12 hr. Both the pipes are opened to fill the tank and after 3 hr Pipe A is closed. Pipe B will fill the remaining part of the tank in:

विकल्प

• 5 hours

• 4 hours

• 5 hours 24 min

• 3 hours

Answer 1

5 hours 24 min

Explanation:

Pipe A can Fill in = 10 hours

Pipe B can Fill in = 12 hours

According to the question,

`⇒3/10+("x"+3)/12=1`

`⇒("x"+3)/12=7/10`

`("x"+3)/6=7/5`

⇒ 5x + 15 = 42

5x = 27

x`=27/5` or 5 hr `2/5xx60` = 5 hr 24 min