802 It is known that the time for reducing the concentration of single particles by a factor of 2 (as a result of rapid coagulation in the ash with the formation of double aggregates) is 30 seconds. Knowing this, calculate the time for decreasing the concentration in the same ash (a) by 1.5 times, (b) by 1.75 times, (c) by 1.25 times.

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