On average, Justin takes 1 less hour to assemble a bicycle than Christina. If working together Justin and Christina can assemble 36 bicycles in a combined 80 hours, how long does it take Justin to assemble a bicycle? Do not include the units in your answer.

i think the answer is b)

step-by-step explanation:

step-by-step explanation:

ok so im not 100% sure but you would start by adding 5.1t and 1.9t beacuse they have the same variable. that is 7t.   then add -3.6 + 1.2 which is -2.4

so then keep that as -2.4 + 7t. i apologize if this is incorrect. best luck on your test < 3