Manny can assemble a computer by himself in 60 minutes. jane does the same job in 55 minutes. how long will it take them to assemble a computer working together?

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it

i think the correct option is the second option.