question_answer

Water flows at the rate of 5 km per hour through a pipe of diameter 14 cm into a rectangular tank which is 25 m long and 22 m wide. Find the time in which the level of water in the tank rises by 21 cm. [Take\[\pi =\frac{22}{7}\].]

A)  2 hours                               

B)  5 hours

C)  3 hours               

D)         1.5 hours