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Verified answer
Waktu pak Andi= 13 jamTa= 13 jam
waktu pak budi= 7 jam
Tb= 7 jam
waktu total jika bersama=Tt
maka:
1/Tt= 1/Ta+1/Tb
1/T=1/13 + 1/7 = 7/91 + 13/91 = 20/91
1/Tt= 20/91
20Tt=91
Tt= 91/20= 4,55 jam
jadi waktu yang diperlukan jika bersama adalah 4,55 jam.