Question

Four people are working to construct a 100m high wall Each person can individually construct the wall in 12 hours. All four people start working to construct the wall, but the first
person leaves once the wall is 25m high, the second person leaves once the wall is 50m high and the third person leaves once the wall in 75m high How much time does it take
to complete the construction of the entire wall?
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Answer 1

Answer:

for people are working to construct a hundred metre high wall is person can induce cell consists of the 12 all in one hour