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1. |
*/*_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?? |
A. | 10 km/hr |
B. | 12 km/hr |
C. | 8 km/hr |
D. | None of these |
Answer» B. 12 km/hr | |