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primary 6 | Maths
| Fractions
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This means that there are 12 - 1 = 11 intervals between the buses (1st to 2nd, 2nd to 3rd, 3rd to 4th, ..., 11th to 12th).
Each interval is 50 minutes.
The last bus must have left 11 x 50 = 550 min = 9 h 10 min after the first bus have passed (assuming the frequencies are strictly obeyed).
The last bus leaves at 8:10 pm.
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