[\dfrac{10}{3}] Two taps A and B can fill a tank in 10 hours and 15 hours respectively. Both the taps are opened for

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Two taps A and B can fill a tank in 10 hours and 15 hours respectively. Both the taps are opened for 4 hours and then B is turned off.
The time taken by A to fill the remaining tank is

$\dfrac{12}{5}$ hours

$\dfrac{13}{10}$ hours

6 hours

$\dfrac{10}{3}$

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