This clock strikes the hour (once for 1, twice for 2, and so on) and strikes once at every half-hour. How many strikes does it make from the time on clock A to the time on clock B, the same day?

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31. A shows 10:15 a.m. and B shows 2:45 p.m. Hour strikes: 11 + 12 + 1 + 2 = 26. Half-hour strikes at 10:30, 11:30, 12:30, 1:30 and 2:30: 5 more. Total 31. (26 forgets the half-hours; 36 also counts 10 o'clock, which was before A.)

This clock strikes the hour (once for 1, twice for 2, and so on) and strikes once at every half-hour. How many strikes does it make from the time on clock A to the time on clock B, the same day?

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