Question

6pipes are required to fill in 1hour 20 minutes . how long will it take if only 5pipes of the same type are used

Answer 1

6 pipes required to fill =1hr 20mins=60+20=80 mns

5pipes required to fill in same type=?

6pipes.......80mns

5pipes....?

5*80/6

5*13.3

66.5

60+6.5

1hr6.5mns