"A rectangular water tank is `80 mxx40 m`. Water flows into it through a pipe 40 sq. cm at
Channel: Doubtnut
Date: 2020-04-12

"A rectangular
 water tank is `80 mxx40 m`
. Water flows
 into it through a pipe 40 sq. cm at the opening at a speed of 10 km/hr. By
 how much, the water level will rise in the tank in half an hour?
`3/2c m`
(b) `4/9c m`
(c) `5/8c m`
(d) None of
 these"