Water flows into a cuboidal tank, 350m long and 200 m wide through a pipe of cross section (0.7m x 0.2m) at 25 km/hr. The time taken (in hours) for the water level to reach 10m is:

210 150 120 200

200

25 km = 25000m ATQ, Total volume deposited by the pipe = Volume of the tank at height 10 m, ⇒ (0.7 x 0.2) x (25000 x T) = 350 x 200 x 10 ⇒ T =  200 hrs.