Can someone help

The multiplication property of zero states that the product of any number and 0 is 0. what must be true about either a or b to make ab=0

This week, conrad will work 1 3/4 times longer than last week. giovanni will work 1 1/3 times longer than last week. sally will work 2/3 the number of hours she worked last week. match each employee's name to the number of hours he or she will work this week

Can someone answer this question? : )