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To make it parallel I would say to put it in this format: We can’t go back; to go forward is our only option. This makes the verbs the same.
First map
1 cm------ 10 km
40 cm---- x
x= (40 * 10) /1
x= 400 km, Cincinnati is 400 km away from Cleveland.
Second map
1 cm------ 50 km
x---------- 400 km
x= (400 * 1) /50
x= 8, Cincinnati is 8 cm away from Cleveland.
Answer:
She wouldnt know if she was getting robbed or if there was a fire or anything dangerous outside or in her house if she uses the powerful earplugs.