25. Tom and Jerry must stuff and mail 1000envelopes for a new marketing campaign. Jerrycan do the job alone in 6 hours. If Tom helps,they can get the job done in 4 hours. How longwould it take Tom to do the job by himself?A. 4 hoursB. 5 hoursC. 8 hoursD. 12 hours​

Answer:12Step-by-step explanation:The general formula for this isFormula1/t1 + 1/t2 = 1/t_totgivenst1 = 6 hourst2 = xt_tot = 4 hoursSolution1/6 + 1/x = 1/4                 Subtract 1/6 from both sides.1/6-1/6 + 1/x = 1/4 - 1/6   Change to 12 as your common denominator 1/x = 3/12 - 2/12              subtract1/x = 1/12                         Cross multiplyx = 12Tom would need 12 hours to do the job alone.