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A large tanke...

Question

A large tanker can be filled by two pipes A and B in 60 minutes and 40 minutes respectively. How many minutes will it take to fill the tanker from an empty state, if B is used for half the time and A and B fill it together for the other half?

15 min

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20 min

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27.5 min

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30 min

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35 min

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Solution

The correct option is D
30 min

Part filled by (A + B) in 1 minute $= (\frac{1}{60} + \frac{1}{40}) = \frac{1}{24}$

Suppose the tank is filled in x minutes.

Then, $\frac{x}{2} (\frac{1}{24} + \frac{1}{40}) = 1 \Leftrightarrow \frac{x}{2} \times \frac{1}{15} = 1 \Leftrightarrow x = 30 m i n .$

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Question 61. A large tanker can be filled by two pipes A and B in 60 minutes and 40 minutes respectively. How many minutes will it take to fill the tanker from empty state if B is used for half the time and A and B fill it together for the other half?

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minutes and

40

minutes respectively. How many minutes will it take to fill the tanker from empty state if B is used for half the time and A and B fill it together for the other half?

Q. A large tanker can be filled by two pipes

A

and

B

60

minutes and

40

minutes respectively, How many minutes will it take o fill the tanker form empty state, if

B

is used for half the time and

A

and

B

full it for the other half ?

Q. A large tanker can be filled by two pipes

A

and

B

60

minutes and

40

minutes respectively. How many minutes will it take to fill the empty tanker if only

B

is used in the first-half of the time and

A

and

B

are both used in the second-half of the time ?

Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank?

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A large tanker can be filled by two pipes A and B in 60 minutes and 40 minutes respectively. How many minutes will it take to fill the tanker from an empty state, if B is used for half the time and A and B fill it together for the other half?

The correct option is D 30 min Part filled by (A + B) in 1 minute =(160+140)=124 Suppose the tank is filled in x minutes. Then, x2(124+140)=1⇔x2×115=1⇔x=30min.

The correct option is D
30 min

Part filled by (A + B) in 1 minute $= (\frac{1}{60} + \frac{1}{40}) = \frac{1}{24}$

Suppose the tank is filled in x minutes.

Then, $\frac{x}{2} (\frac{1}{24} + \frac{1}{40}) = 1 \Leftrightarrow \frac{x}{2} \times \frac{1}{15} = 1 \Leftrightarrow x = 30 m i n .$