Answer : (scroll below)
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Answer = 3 mins
See clearer if change person to taxi car, bun to passenger.
9 taxi cars send 9 passengers will take the SAME timing as 3 taxi cars send 3 passengers.
Fun Math
Answer : (scroll below)
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Answer = 3 mins
See clearer if change person to taxi car, bun to passenger.
9 taxi cars send 9 passengers will take the SAME timing as 3 taxi cars send 3 passengers.
Mathtuition88 