Question

7. 10 pipes of the same type fill a tank in 24 minutes. If two pipes go out of order, how long will the remaining pipes take to fill the tank?
a)86/5min
b) 30 min
(c) 40 min
(d) 45 min
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Answer 1

Answer:

here is your answer ;-)

Step-by-step explanation:

10 pipes of the same type fill in 24 minutes = 1 work

part of work done by 10 pipe in 1 minute = 1/24

part of work done by 1 pipe in 1 minute = 1/24×10

= 1/240

part of work done by 8 pipe in 1 minute = 1×8/240

= 1/30

Hence, 8 pipe will take 30 minutes to fill.

Answer 2

Answer:

b) 30 mins

Step-by-step explanation:

Time taken to fill tank by 10 pipes = 24 mins

Time taken to fill tank by 1 pipe = 24 × 10

= 240 mins

Time taken to fill tank by 8 pipes = 240 / 8

= 30 mins