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Question
A tank is 7 metre long and 4 meter wide wide. At what speed should water run through a pipe 5 cm broad and 4 cm deep so that in 6 hours and 18 minutes water level in the tank rises by 4.5 meter?
Options:
A .  10 km/hours
B .  12 km/hours
C .  8 km/hours
D .  None of these
Answer: Option A

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