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Mathematics
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We need to first find the angle that the hand will move, and from there we can convert to time elapsed To find the angle: the line along the circumference is given as 40pi the circumference's total length is 2*pi*r, or 120pi This means that the clock needs to travel 1/3 the length of the clock, or 120degrees 120 degrees relates to 1/3*12 hours = 4 hours. Therefore, the clock will explode at 10 +4 hours, or at 2:00
40pi=120 degree?
no, 40pi/120pi gives you 1/3 of the circle, which is 120 degrees. This only happened because we had a radius of 60cm. If it were different, the degree would be different as well.

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how u get 120 degree?
40pi along the circumference out of 120pi total that's 1/3 of the way along the circumference That means that, out of 360 degrees (one full circle/circumference), we went 1/3 of the way: 1/3*360 = 120
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