Question
Pipes 'A' and 'B' have the capacity to fill a tank in 12
hours and 15 hours, respectively. Conversely, pipe 'C' can drain the same tank in 20 hours. Initially, when the tank is empty, pipes 'A' and 'C' are turned on simultaneously and left running for 25 hours. Following this, pipe 'B' alone is used to complete the filling of the tank. Calculate the total duration required to fill the tank using this approach.Solution
Let the total capacity of the tank be 60 units Efficiency of pipe ‘A’ = 60/12 = 5 units/hour Efficiency of pipe ‘B’ = 60/15 = 4 units/hour Efficiency of pipe ‘C’ = 60/20 = 3 units/hour Tank filled by pipe ‘A’ and pipe ‘C’ in 25 hours = 25 × (5 – 3) = 50 units Time taken by pipe ‘B’ to fill the remaining tank = (60 – 50)/4 = 2.5 hours Therefore, total time taken to fill the tank = 25 + 2.5 = 27.5 hours Hence, option a.
In a factory all Tuesdays and Saturdays are offs. If a month starts with a Tuesday and has 31 days then how many offs will be there in that month?
If the day before yesterday was Wednesday, then the day after tomorrow will be:
At what angle the hands of a clock are inclined at 25 minutes past 9?
Which two months in a year have the same calendar?
At 9:45 in a clock, the angle between the minute and hour hands is:
- When seen through a mirror, a clock shows 2:45hrs. The correct time is ___.
- What will be the angle formed between the hour hand and minute hand of a clock at 6:48am?
- It was Thursday on February 8, 2024, then, what will be the day on February 8, 2028?
If it was Sunday on 1st February 2020, then what was the day on 1st October 2020?
What is the reflex angle between the hands of a clock at 8:30?
Relevant for Exams:
