self Maths Puzzle

how much time does it take to weight a small change in weight bag among 4 equal bags?

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self Other Question

Four pipes fill a cistern in 15,20,30 and 60 hours.The first was opened at 6 am,the second at 8 am,third at 10 am and fourth at noon.When will the reservoir be full? SON:HOW MUCH TIME DOES IT TAKE TO GO TO OFFICE FROM HOME?
FATHER:WHEN I START THE MINUTES AND HOUR HAND AT SAME PLACE AND WHEN I GO TO OFFICE THEY ARE AT OPPOSITE TO EACH OTHER?
SON:DOES THEY ARE EQUAL WHEN YOU START
AT HOME AND GO TO OFFICE?
GUESS THE TIME TAKEN
FOR JOURNEY