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Two pipes A and B can fill a tank in 10 hrs and 40 hrs respectively. If both the pipes are opened simultaneously, how much time will be taken to fill the tank?

8 hours
6 hours
4 hours
2 hours
Explanation:

Pipe A can fill $\dfrac{1}{10}$ of the tank in 1 hr

Pipe B can fill $\dfrac{1}{40}$ of the tank in 1 hr

Pipe A and B together can fill $\dfrac{1}{10}+\dfrac{1}{40}=\dfrac{1}{8}$ of the tank in 1 hr

i.e., Pipe A and B together can fill the tank in 8 hours

Additional Questions

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If a mans rate with the current is 15 km/hr and the rate of the current is 11/2 km/hr, then his rate against the current is

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The speed of the boat in still water in 12 kmph. It can travel downstream through 45 kms in 3 hrs. In what time would it cover the same distance upstream?

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The current of stream runs at the rate of 4 km an hour. A boat goes 6 km and back to the starting point in 2 hours. The speed of the boat in still water is :

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