Fill in the blanks to make the statement true:If 12 pumps can empty a

1.	Fill in the blanks to make the statement true:If 12 pumps can empty a reservoir in 20 hours, then time required by 45 such pumps to empty the same reservoir is ______ hours.
Answer» Time taken by 12 pumps to empty a reservoir = 20 hr Time taken by 1 pump to empty the reservoir = 20 × 12 = 240 hr Hence, time taken by 45 pumps to empty the reservoir = 240/45 = (240 × 60)/45 = 14400/45 = 320 min = 5×69 + 20 min = 5 hour 20 min

Fill in the blanks to make the statement true:If 12 pumps can empty a reservoir in 20 hours, then time required by 45 such pumps to empty the same reservoir is ______ hours.

Answer»

Time taken by 12 pumps to empty a reservoir = 20 hr

Time taken by 1 pump to empty the reservoir = 20 × 12 = 240 hr

Hence, time taken by 45 pumps to empty the reservoir = 240/45 = (240 × 60)/45

= 14400/45 = 320 min

= 5×69 + 20 min

= 5 hour 20 min